Thank you for your message.
We will manage inventory based on Sales Orders which are pulled through from your Sales Channels. When an order is pulled into Expandly, we will check your products based on the Listings ID, SKU/ and or Title and if there is a match, then we will update the stock quantity on Expandly and also all of the listings attached to that product.
I hope this helps. If you have any further questions or queries, please get back in touch and we will be happy to help!