diff --git a/src/isGoodSimFcnName.m b/src/isGoodSimFcnName.m
new file mode 100644
index 0000000..8582d46
--- /dev/null
+++ b/src/isGoodSimFcnName.m
@@ -0,0 +1,38 @@
+function goodName = isGoodSimFcnName(subsystem, simulinkFcnName)
+% isGoodSimFcnName          Checks to see if a Simulink Function name is the
+%                           same as any other Simulink Functions in scope at
+%                           the current subsystem level
+% Inputs:
+%   subsystem               Path of a subsystem where a Simulink Function
+%                           will be added
+%   simulinkFcnName         Name of the Simulink Function to be added
+%
+% Outputs:
+%   goodName                Name can be used(1) or not(0)
+%
+% Example:
+%   isGoodSimFcnName('SubSystem_Name', 'SimFcnName')
+%
+%           ans = 1
+
+    % Get callable Simulink Functions at the current scope
+    [~, prototype] = getCallableFunctions(subsystem);
+    
+    % Get the prototype names
+    prototypeNames = getPrototypeName(prototype);
+    
+    % Make sure the prototype name is a cell
+    if ~iscell(prototypeNames)
+        prototypeNames = {prototypeNames};
+    end
+    
+    result = zeros(1, length(prototypeNames));
+    
+    % Loop through each prototype name
+    for name = 1:length(prototypeNames)
+        % Compare to the input name
+        result(name) = ~strcmp(simulinkFcnName, prototypeNames{name});
+    end
+    % Return true if none of the prototype names are the same as the input name
+    goodName = all(result);
+end
\ No newline at end of file
diff --git a/src/isSubsystem.m b/src/isSubsystem.m
new file mode 100644
index 0000000..a4babb2
--- /dev/null
+++ b/src/isSubsystem.m
@@ -0,0 +1,22 @@
+function b = isSubsystem(blocks)
+% ISSUBSYSTEM Determine if the block is a subsystem.
+%
+%   Inputs:
+%       block   Pathname or handle of a block.
+%
+%   Outputs:
+%       b       Whether the block is a subsystem(1) or not(0).
+    
+    % Convert the input to handles
+    blocks = inputToNumeric(blocks);
+    
+    b = zeros(1, length(blocks));
+    % Check each block to see if its a subsystem
+    for block = 1:length(blocks)
+        try
+            blockType = get_param(blocks(block), 'BlockType');
+            b(block) = strcmpi(blockType, 'SubSystem');
+        catch % Unexpected error
+        end
+    end
+end
\ No newline at end of file
diff --git a/src/reqSimFcnName.m b/src/reqSimFcnName.m
new file mode 100644
index 0000000..8cda13d
--- /dev/null
+++ b/src/reqSimFcnName.m
@@ -0,0 +1,37 @@
+function simulinkFcnName = reqSimFcnName()
+% getSimFcnName             Prompts the user for an input Simulink Function name
+%                           until a name is entered which is not the same as
+%                           another Simulink Function in scope
+%                                                 
+% Inputs:
+%   N/A
+%
+% Outputs:
+%   simulinkFcnName         Char array which represents a Simulink Function name
+%
+% Example:
+%   simulinkFcnName = getSimFcnName()
+%
+%           ans = 'Function_Name'
+
+    %% Dialog Box Parameters
+    prompt = 'Enter a name for the Simulink Function: ';
+    dlgtitle = 'Convert Subsystem';
+    dims = [1 50];
+    definput = {'f'};
+            
+    %% Checking Input
+    % Loop until the input name is acceptable
+    while 1
+        inputName = inputdlg(prompt, dlgtitle, dims, definput);
+        % Checks to see if the name shadows other names in scope
+        if isGoodSimFcnName(gcs, inputName{1})
+            break
+        else
+            waitfor(msgbox([inputName{1}, ...
+                    ' is already used as a Simulink Function in scope.', ...
+                     newline, newline, 'Please enter a new name.'], dlgtitle));
+        end
+    end
+    simulinkFcnName = inputName{1};
+end
\ No newline at end of file
diff --git a/src/sl_customization.m b/src/sl_customization.m
index e3e643c..94f71ab 100644
--- a/src/sl_customization.m
+++ b/src/sl_customization.m
@@ -16,9 +16,44 @@ function sl_customization(cm)
     elseif any(selectedFcns) && ~isempty(gcbs)
         schemaFcns{end+1} = @ChangeFcnScopeSchema;
         schemaFcns{end+1} = @FcnCreatorLocalSchema;
+    elseif isSubsystem(gcbs)
+        schemaFcns{end+1} = @ConvToSimFcnSchema;
     end
 end
 
+%% Define action: Convert Subsystem to Simulink Function
+function schema = ConvToSimFcnSchema(callbackInfo)
+    schema = sl_container_schema;
+    schema.label = 'Convert Subsystem';
+    schema.ChildrenFcns = {@toScopedSimFcn, @toGlobalSimFcn};
+end
+
+function schema = toScopedSimFcn(callbackInfo)
+    schema = sl_action_schema;
+    schema.label = 'To Scoped Simulink Function';
+    schema.userdata = 'toScopedSimFcn';
+    schema.callback = @toScopedSimFcnCallback;
+end
+
+function toScopedSimFcnCallback(callbackInfo)
+    simulinkFcnName = reqSimFcnName();
+    subsystem = gcbs;
+    subToSimFcn(subsystem{1}, simulinkFcnName, 'scoped');
+end
+
+function schema = toGlobalSimFcn(callbackInfo)
+    schema = sl_action_schema;
+    schema.label = 'To Global Simulink Function';
+    schema.userdata = 'toGlobalSimFcn';
+    schema.callback = @toGlobalSimFcnCallback;
+end
+
+function toGlobalSimFcnCallback(callbackInfo)
+    simulinkFcnName = reqSimFcnName();
+    subsystem = gcbs;
+    subToSimFcn(subsystem{1}, simulinkFcnName, 'global');
+end
+
 %% Define action: Create Function Caller for Local Function
 function schema = FcnCreatorLocalSchema(callbackInfo)
     schema = sl_action_schema;
diff --git a/src/subToSimFcn.m b/src/subToSimFcn.m
new file mode 100644
index 0000000..fc790c2
--- /dev/null
+++ b/src/subToSimFcn.m
@@ -0,0 +1,190 @@
+function subToSimFcn(subsystem, simulinkFcnName, visibility)
+% subToSimFunc              Converts a subsystem to a Simulink Function
+%
+% Inputs:
+%   subsystem               Path of a subsystem to be converted
+%   simulinkFcnName         Name of the Simulink Function to be created
+%   visibility              Set function visibility to'scoped' or 'global'
+%
+% Outputs:
+%   N/A
+%
+% Example:
+%   subToSimFunc('Demo_Example/f_Sensor_Trip_1', 'f_Sensor_Trip_i', 'scoped')
+%
+%           Converts 'f_Sensor_Trip_1' subsystem to a
+%           scoped Simulink Function 'f_SensorTrip_i'
+
+    %% Input Validation
+    
+    % Check that the subsystem is loaded
+    try
+        assert(ischar(subsystem));
+        assert(bdIsLoaded(bdroot(subsystem)));
+    catch
+        error('Invalid subsystem. Model may not be loaded or name is invalid.');
+    end
+    
+    % Check that the function name is valid
+    try
+        assert(isvarname(simulinkFcnName));
+    catch
+        error('Invalid function name. Use a valid MATLAB variable name.');
+    end
+    
+    % Check that the function visibility is valid
+    try
+        assert(strcmp(visibility, 'scoped') || strcmp(visibility, 'global'));
+    catch
+        error('Invalid function visibility. Use scoped/global visibility.');
+    end
+    
+    %% Add Trigger to Subsystem
+    
+    % Break library link
+    set_param(subsystem, 'LinkStatus', 'none');
+
+    % Adding the trigger block to the subsystem and calibrating its parameters
+    triggerPath = append(subsystem, '/', simulinkFcnName);
+    add_block('simulink/Ports & Subsystems/Trigger', triggerPath);
+    set_param(triggerPath, 'TriggerType', 'function-call', ...
+              'IsSimulinkFunction', 'on', 'FunctionName', simulinkFcnName, ...
+              'FunctionVisibility', visibility);
+    
+    % Set subsystem to atomic execution
+    set_param(subsystem, 'TreatAsAtomicUnit', 'on');
+    
+    %% Convert Inports to ArgIns
+    
+    % Create array of all the inports in the subsystem
+    allInports = find_system(subsystem, 'SearchDepth', 1, ...
+                             'BlockType', 'Inport');
+    
+    % Getting the parameters for all inports in the subsystem
+    inportParameters = getPortParameters(allInports);
+    
+    % Replace inports with argument inputs
+    replace_block(subsystem, 'SearchDepth', 1, ...
+                  'BlockType', 'Inport', 'ArgIn', 'noprompt');
+    
+    % Create array of all the argIns in the Simulink Function
+    allArgIns = find_system(subsystem, 'SearchDepth', 1, 'BlockType', 'ArgIn');
+    
+    % Setting the parameters for all the argument inputs
+    setArgumentParameters(allArgIns, inportParameters);
+    
+    %% Convert Outports to ArgOuts
+    
+    % Create array of all the outports in the subsystem
+    allOutports = find_system(subsystem, 'SearchDepth', 1, ...
+                              'BlockType', 'Outport');
+    
+    % Getting the parameters for all outports in the subsystem
+    outportParameters = getPortParameters(allOutports);
+    
+    % Replace outports with argument outputs
+    replace_block(subsystem, 'SearchDepth', 1, ...
+                  'BlockType', 'Outport', 'ArgOut', 'noprompt');
+    
+    % Create array of all the argOuts for the Simulink Function
+    allArgOuts = find_system(subsystem, 'SearchDepth', 1, ...
+                             'BlockType', 'ArgOut');
+    
+    % Setting the parameters for all the argument outputs
+    setArgumentParameters(allArgOuts, outportParameters);
+end
+
+function parameters = getPortParameters(ports)
+% getPortParameters     Returns the parameters for an inport or outport
+%
+% Inputs:
+%   ports               Cell array of inports or outports
+%
+% Outputs:
+%   parameters          Cell array of parameters including:
+%                           1) Port
+%                           2) OutMin
+%                           3) OutMax
+%                           4) OutDataTypeStr
+%                           5) LockScale
+%                           6) PortDimensions
+%                           7) ArgumentName
+%
+% Example:
+%   parameters = getPortParameters({'System/Subsystem/Inport1'})
+%
+%           ans = 
+%                1x7 cell array
+%                    {'1'} {'[]'} {'[]'} {'boolean'} {'off'} {'on'} {'Inport1'}
+
+    %% Get the port parameters
+    % Init array of parameters for the ports
+    parameters = cell(length(ports), 7);
+    % Loop through each port
+    for port = 1:length(ports)
+        % Get the port name by splitting the pathname by the backslash
+        splitPortPath = split(ports{port}, '/');
+        % The port name is the last index of splitPortPath
+        portName = splitPortPath{end};
+        % Get the port number
+        parameters{port, 1} = get_param(ports{port}, 'Port');
+        % Get the port minimum output
+        parameters{port, 2} = get_param(ports{port}, 'OutMin');
+        % Get the port maximum output
+        parameters{port, 3} = get_param(ports{port}, 'OutMax');
+        % Get the port data type
+        parameters{port, 4} = get_param(ports{port}, 'OutDataTypeStr');
+        % If data type is set to inherit, set to double by default
+        try
+            assert(not(strcmp(parameters{port, 4}, 'Inherit: auto')));
+        catch
+            disp([portName, ...
+                  ' data type was set to ''Inherit: auto''', ...
+                  ' - setting to ''double''...']);
+            parameters{port, 4} = 'double';
+        end
+        % Get the port lock scale
+        parameters{port, 5} = get_param(ports{port}, 'LockScale');
+        % Get the port dimension
+        parameters{port, 6} = get_param(ports{port}, 'PortDimensions');
+        % If port dimension is set to inherit, set to 1 by default
+        try
+            assert(not(strcmp(parameters{port, 6}, '-1')))
+        catch
+            disp([portName, ...
+                  ' dimension was set to ''-1''', ...
+                  ' - setting to ''1''...']);
+            parameters{port, 6} = '1';
+        end
+        % Remove spaces from port name to create a valid variable name
+        parameters{port, 7} = genvarname(portName);
+    end
+end
+
+function setArgumentParameters(arguments, parameters)
+% setArgumentParameters     Sets argIn or ArgOut parameters
+%
+% Inputs:
+%   arguments               Cell array of argIns or argOuts
+%   parameters              Cell array of parameters for each argument
+%
+% Outputs:
+%   N/A
+%
+% Example:
+%   setArgumentParameters({'System/Subsystem/argIn1'}, ...
+%                         {'1', '[]', '[]', 'boolean', 'off', 'on', 'Inport1'})
+
+    %% Set the argument parameters
+    % Loop through each argument
+    for arg = 1:length(arguments)
+        % Set the parameters for each argument
+        set_param(arguments{arg}, 'Port', parameters{arg, 1}, ...
+                  'OutMin', parameters{arg, 2}, ...
+                  'OutMax', parameters{arg, 3}, ...
+                  'OutDataTypeStr', parameters{arg, 4}, ...
+                  'LockScale', parameters{arg, 5}, ...
+                  'PortDimensions', parameters{arg, 6}, ...
+                  'ArgumentName', parameters{arg, 7});
+    end
+end