To filter products on the warehouse you need to navigate to System>Shipping Methods>Webshopapps Product Matrix Rates>Advanced Settings and set the “Attribute to Filter Products On” to “warehouse”

By default this is set to “package_id”.

 

 

 

 

 

 

 

 

 

 

 

 

 

You will then need to take a note of the warehouse ID from the Warehouse Manager Screen.

In my example i have created 2 warehouses.

The ID’s for the ware house can be found in the ID column. so in my example the ID for Harrison Warehouse is “1” and for California “2”.

The next step is to configure the CSV file to change the Shipping Group column with the warehouse ID.

The CSV will  look like this if you have 2 warehouse.

 

The next step is to assign the warehouse to the product:

When the shipping is calculated it will now use the warehouse id to match on.