Workforce Engagement Management

Hi,

I am looking for the best approach to display the planning of agents of external contact center that handles overflow calls. 
Our customer receives weekly a file containing the agents' names along with their schedules (shift start and end time per day). 
The import would be used for visibility about the planning of the external CC

What would be the best approach? Should we use activity codes? Do we need to add these agents in a planning (create GC logins?)
Anyone experience with importing schedules?

Thank you,

Geert