If you want orders from a specific self managed supplier to be automatically delivered into a specified advanced stock outlet no matter the parent site on the order, so that when an order for this supplier is delivered into the destination site stock will be removed from the designated source outlet. If so this is managed in the following page:
Click the Admin Cogs
icon along the top bar.Click Suppliers, then click Manage Suppliers.
Locate the self managed supplier within the current tab and click on the suppliers Name or Magnifying Glass icon.
From the details tab locate the section advanced stock depletion of stock and select the source outlet from the list.
Once selected click the Save Settings button to confirm any changes.