Split by Warehouse Plugin
Split by Warehouse is a function offered through a post-order plugin. The plugin will check the preferred warehouses and ship from them.
In Custom Company Settings > WarehouseIDs In Order Of Preference - Enter the IDs of the warehouses you want to ship from in order of preference (split by semicolons, no blank space).
The plugin will always check for quantities in the first warehouse; if available, it will ship from there. If not, it will move to the next warehouse on the list and check there, then the third, etc.
Related Client Settings
In the Client Settings > enable Run Post order plugin on Replacement Orders - This setting will include Replacement Orders in the post-order plugin workflow.