Assign group access to a project role
You can grant access to project roles and applications through groups. Simply add a user to a group with predefined security settings to give them the access they need. Creating a clear security model, with specialized user groups, that grant specific access to applications is the easiest way for longterm admin support.
The best way to give users access to a project role is to grant access to a group. This way you can assign a group access and then simply add a user to the group and save yourself some time managing individual user permissions.