The rep page displays all the important information about that specific rep.
On this screen you can also add to the 3 tabs at the bottom of the screen:
In this tab you can add a territory with a country, post code and regions, you can also assign that territory to a product. To do this click the button.
On this tab you can add companies that this rep is involved with by clicking button.
You can link this rep to any orders here, this is backwards compatible so when making an order you can add a rep to it and the order will automatically appear on the reps orders tab. To add orders click the button.