Please HELP beginner with USMT customization

Can someone help point me in the right direction on how to customize the USMT so that it only captures specific files and folders for a specific user. I’m very new to USMT.
Currently when we do a laptop repair, we set the user up on a loaner and manually copy specific files and folders from the users profile to the loaner laptop. Would like to make the process more automatic and also would ensure we don’t forget a file or folder.