If using the Event Registration Form (Classic) part type [labeled as "Event Registration Form" in NetCommunity version 6.45 and below]:

The Pricing Units for an Event Registration Form (Classic) part are created in the Raiser's Edge on the Event Record. They appear on the Event Registration Form (Classic) part type in the order that they were created in the Raiser's Edge.
To change the order of these pricing units in the Event Registration Form (Classic) part type:
  1. Log into the Raiser's Edge and open the Event Record
  2. On the Pricing tab, remove all the pricing options as they appear
  3. Add Price Unit in the order you want them to appear in NetCommunity
  4. Log into NetCommunity with the necessary rights to edit parts
  5. Refresh code tables,
  6. Edit the event registration form part
  7. Click the Scissors for Remove event for the event you want to change the order of the price units for
    • You will need to reconfigure all of the fields after you readd the part. Make note of any Description or names, if needed.
  8. Click Add event to re-add the event to the part, and fill out required fields
  9. Click Save
    • If the pricing levels do not appear immediately, you may need to refresh code tables again, and repeat the steps to add the event

If using the Event Registration Form part type in NetCommunity version 6.50 and above:
  1. Log in to the NetCommunity website
  2. Edit the event registration form part
  3. Click Edit next to the Event you would like to alter
  4. Click and Drag pricing options into any order
  5. Click Save when finished

Additional Resources
How to change the order of the events listed on an event registration form