Discounts can not be deleted. To make discounts unavailable during registration, either unapprove the discount or remove all participation type associations.

To unapprove the discount:
  1. Select Fundraising > TeamRaiser
  2. Find the correct TeamRaiser and click Edit
  3. Click Manage Discounts
  4. For each unwanted discount, click Edit
  5. Click on step e at left, Approve Discount
  6. At right, click on the blue Unapprove Discount box

To remove participation type associations:
  1. Follow steps 1 - 3, above
  2. For each discount, click Associate
  3. Click the red Remove All button