In the event dashboard, click on Registrations.

From the sidebar menu, select “Setup Coupons”

Select “Provide Discount” and click next.

In the select discount step, select “Percentage” and click next.

Enter the coupon code, the discount percentage, and the maximum discount amount. Then click "Advanced"

In the advanced section, you can set up the number of times this coupon can be used and the tickets to which this coupon can be applied.

Once set up, click next, which shows the summary of the coupon to be set up.

How to set up a coupon to provide a percentage of the cart value as a discount?