How to add material to single object

[Nelfx]

So, I made a nice model in blender and wanted to texture it in Amorpaint. It was a bunch of different objects, but when adding materials it would add them to the entire thing

[Granada1]

You will need a Color I’d map for that

https://www.google.co.uk/search?q=color+id+map&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari