How to create a new user, that is a new role?

Hi, 

The below has been asked by the lovely Rebecca Smith

Please could you remind me where/how to create a new profile, non-role.

I need to create an HR coordinator role, so that one of our team can access particular records, but not senior team. It's a new position so I don't want to give access to everything at once.

How can I create this please?