You do not need to assign a location group to a Promo or Coupon campaign that targets "All Locations". If you do, you will manually have to add each new location to that group when a new location opens for your business.
Instead, leave that field blank in step 2 of the campaign and the system will automatically target all locations as this is the default functionality.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)