Trouble trying to copy the gallery in timesheet app

[jaxkookie]

Hi @aprildunnam ,
I love your work, and I am a long-time follower. I have been using your timesheet app for a little over a year. One issue I need help resolving is copying an existing timesheet into a different week. In the app, it looks like it works. The user can save it, but the data is not saved to SharePoint. With a few tweaks, it works sometimes. On the BillTo dropdown in the galleryTimeCard I added some code that I thought would lookup the id of the BillTo and retain the value, but it failed. I cannot figure out how to copy the previous timesheet and save the data to the BillTo dropdown: this is the code I have set in the Default and DefaultSelectedItems. Can you help me with any input or direction?
If( varCopy = true, LookUp( colBillTo, ID = ThisItem.BillTo.Id ), ThisItem.BillTo )