You can assign multiple products to a manufacturer without having to edit them separately. Note that this can only be done by administrators. 

How to change the manufacturer of multiple products:

  1. Sign in as an administrator
  2. Click inventory in the left sidebar
  3. Select products you'd like to assign to a manufacturer


    Tip: By selecting the top check box, next to the Name column heading, you select all products on the list. You can also select a product category from the menu on the left, and then select particular or all products from that category.

  4. Click edit selected on the right:


  5. Select the option assign to a manufacturer
  6. Select the manufacturer you'd like to assign the products to and click assign: