Dissociate project role and enterprise role

The scenario which we would like to achieve is as below:

• Project roles are created without assigning any enterprise role (e.g. role A & role B)
• Meanwhile, a user is assigned with an enterprise role through security console (e.g. project manager)
• The user is assigned to project 1 with role A, and project 2 with role B.
• The user should have project manager access for both project 1 and project 2

The user should have all features associated to the project manager enterprise role as long as he/she is a member of the project. The project role assigned to the user should be ignored and purely for tagging purposes.