The system allows you to put multiple store locations into a group, otherwise known as Regions. This allows regional managers to oversee all of their locations, and when they are signed in, they see information only pertaining to their group of stores.
To create a Region, go to Setup > Regions. Select the "Add New Region" button. Give the region a name, and select the corresponding store locations for that region under the Locations list. Select the "Save Region" button to save.