Log in to the Amazon seller backend, find the settings in the upper right corner-click fulfillment by amazon under settings, find the inbound setting and click Edit in the upper right corner, select inventory placement service and click update to complete the combined warehouse application. Of course, not all warehouses on all sites support combined warehouses. Japan, Germany and Europe do not support combined warehouses.

Of course, if sellers want to combine warehouses, they need to pay a combined warehouse fee. Taking Amazon's US site as an example, the combined warehouse fee is related to the weight and size of the seller's products:

A combined warehouse fee of US$0.3 is charged for standard sizes below 1 pound, and a combined warehouse fee of US$1.3 is charged for sizes exceeding the standard.

It can be said that if sellers want to combine warehouses, they will increase the products they need to operate, and this fee is still not low. For this reason, sellers can calculate this fee before they want to combine warehouses.