This inventory transfer happens at the Inventory Management level. It also requires both inventory records to exist.
First, ensure the Warehouse you need is available. Please see the article below on how to "Add a Warehouse / Inventory to a Product"
To initiate the inventory transfer
Go to the specific product.
In the Inventory section, click on the blue Manage button.
On the left, click on Transfer
Fill out the form and click Perform Transfer
