The Multistore tab will be visible when multiple locations are enabled in your Channels account. All Multistore settings are found on the Multistore Tab.
Order Routing and Store Priority
Channels uses the Store Priority List to determine where to route orders to first. You set the Store Priority, as desired.
Channels will look first in the top store then work down the list. If no location has inventory for all line items, the order will be routed to the top store.
Whenever an order is routed, the routing is written back to Shopify in the Order Notes so that it appears in Shopify and in the resulting Point of Sale Invoices. The Order is also tagged in Shopify with the fulfillment locations that received items from the order allowing you to easily create Saved Searches in Shopify to identify orders routed each location.
When Order Splitting is on, Channels will try to fulfill the order from a single location first by looking first in the top store then work down the list. If no single location can fulfill all line items and quantities, the order will be split between the first locations that have inventory for each item.
If a location does not have the quantity needed to fulfill the order, quantities for the line item will also be split and assigned to locations to ensure that the full quantity is fulfilled.
Check out more Multistore features: