Select secondary “userrole” when logged in

Hi buddies..

im looking for some ideas how to add a secondary user role that the user chooses when logged in. 
My users will sit at different positions throughout the day and I want to filter views based on their position. I’m thinking if it’s possible to add a selection in frontpage to allow user to select their current position which will filter menus to only show the current tasks for that position.

Due to specific tasks and to do’s on the different positions, I only want them to see these tasks.

if they change position, they will log out and change to the new position. 

Current I only have userroles; user, supervisor and admin.

please give me some ideas or templates

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