You can intentionally prioritize waitlist members (e.g. VIPs, long-time clients, special cases) instead of relying only on signup time so clients have a certain spot in the waitlist line.
How to reorder on the waitlist:
Go to the class roster under Full Schedule or Classes
Select "Waitlist" in the top, left:
Use the drag and drop feature to move a client in the waitlist
Once you drop the client into the new spot, the waitlist number will be updated!