You must have Admin Level - SuperUser access to add a multi-athlete discount to a registration.
Click Org Tools > Registration Admin from the left navigation menu.
Click on the underlined Registration you would like to add the percent discount for
Click on the Fees Setup tab
Click Next
Scroll down to the Multi-Athlete Discount and select Yes - Percentage from the drop-down menu.
After selecting the percentage, apply the percent discount (discount is calculated on the total of Per Member (Athlete) Charges only) at the standard 2-5 athlete tiers. The discount shows as a single line item credit.
The discount is calculated on total fees for ALL athletes in the cart minus any non-discounted groups.
Click Save Changes.