Every time you make a new outlet, usually the buy menu is disabled for the outlet, so that you can't do the restock or input the inventory count for the products, here is the step to enable buy menu at your new outlet.
1. If you want to add new outlet, you can go to Outlets Menu - Add - Insert the Outlet Name
2. As you can see it's not available in new menu
3. Click at the outlet name you have made - Go to configuration - Tick yes at the Buy Config
4. Go to Buy Menu and your new outlet is available for buy menu