Sysadmin

I'm trying to set up a Windows system so that all multiple logins are tied to the same local user. I want it to be multiple logins so nobody has to share a password and it needs to be effectively the same user so that saved items are easy to find. Other than using GPOs to remap things like documents to be a logcal user at login does anyone know a clean way to go about this? A lead hand signs into the system at the beginning of a shift and then other people use the computer to operate a connected device. So if they save a file another person could have logged in next time they try to open it and our users aren't always the smartest and the more uniform it is for them the better.