There are 3 options to add more SKUs for one ASIN: via the manual "new campaign" creation flow, campaign information edit, or via the bulk import

Option 1: Via the "new campaign" creation flow

  1. Create a new campaign

Option 2: campaign information edit

Click on the campaign name

Scroll to the "Items to advertise" option and click on "+Add SKU"

Add the SKUs, each in a new line.

Option 3: Via the import functionality

Download the Excel template and fill in all mandatory information. 

Add the SKUs in the SKU column, separated by a semicolon. 

Save the Excel and drag it into the "Import campaigns" screen.

(Please find attached the bulk import excel.)