I sent 10 widgets into Amazon, for FBA. They are listed on AZ for sale.
I also wish those 10 items to be available for sale on eBay.
Then, as they sell on AZ, and get fulfilled by FBA, I'd like the qty on eBay to tick down, accordingly.
When one sells on eBay, I'll go over to AZ, and create a fulfillment order. Doing so, should reduce my inventory in SB properly, also.
This is a very common scenario, when folks use AZ to fulfill their eBay/Etsy/Other orders.
How do I set up my allocation plans, in SB, to perform the above?