distribution best practices

Hi Fellow BI Users,

I am looking for some advise on determining the best approach to provide access to dashboards to my team that gives 10 members a "sandbox" that they can configure as they see fit while maintaining a "Master" workspace.  I want them to be able to adjust the reports within the dashboard as they see fit while maintaining a master dashboard.

All users have Power BI Pro Licesnses. 

Do I create 10 different app or do I create 10 different workspaces?

Is there a way to make a duplicate dasboard without going to each tile and republishing to a new dashboard (I have 50 tiles/reports).

Currently when I give them permission to edit dashboard, if they save and manupulate components that other users may want  I have to go into the dashboard and reconfigure the properties.

In general, I haven't been able to find any documentation on methods/best practices on giving teams access to dashboards.

Please advise.

Here is a snapshot of the dashboard.