To set up depots, access the data of one of your vehicles and inside the Depot field, in the tab General, click on the arrow and then on the pencil icon.
Click on the + to insert a new depot or on the blue arrow besides the name of an already existing one to modify it.
To register a new depot you can follow the guide for manage you places.
The only difference is that here you have to specify the vehicle typologies that belong to each depot.
Once you have inserted all the required data, save and use the new depot.