For this you would have to create imports one by one per each of the models. You would need some access management model with user adding mechanism (users/roles/ selective access as lists). Then a button per each of the models which will push your new users.
New UX page builder might be helpful.
Extra:
If you want to get a full list of existing accesses with some statistics data (last login date, usage and such) you can request it via support@anaplan.com.
