The proper way to do this is to create groups and then assign groups to apps.
So for example you make a group call Customer Service Reps, Suzi leaves the company and Fred join as her replacement Customer Service trainee. You just put Fred into the Group and boom, he has access to he 5 apps that he needs to do his job.
Trying to onboard new hires into an environment which has many Quick Base apps is a losing game unless you organize your staff into groups and then have the internal discipline to not assign users to apps but main groups to app for their permissions..
group names are global across all of Quick Base, so I suggest a naming convension like
mycompany.Customer.Service.Reps
mycmpany.all.managers
mycompany.all .sales.reps