Fixing an incorrect Split

When you Split a reservation, you're asked how to handle the linking of the 2 parts.  The recommended option, as noted in the selection dialog, is to make the 1st half a sub-member of the 2nd half (so the new/current part is the "main" reservation).  However if you're not in the habit yet, you might choose the opposite option by mistake.  Worse, you might assign a new site to the 2nd half and then make another reservation in the newly-vacated previous site before you realize your mistake, making it difficult to go backwards and re-split.

Unfortunately there isn't an easy shortcut to just swap which reservation is the submember.  The simplest way is to correct the problem is this:

First, Delete the new/current part of the reservation.  All transactions are on the old part, so it should be simple to delete the new part (under Reservation Details, click "Delete").

If you can extend the old part by at least 1 day (e.g. if no other reservation is in the way), then extend it, and do the split again on the same date you did before (the new part will only have 1 day so far).  After the split, you can change the site of the new part if needed, and change the dates accordingly.  Note that you may also need to undo a check-out of the old part before it lets you extend it -- in Reservation Details, uncheck the "Checked Out" box.

If you don't have a way to extend the old part then do the split anyway, on the last day (one day sooner than you really want the split to occur).  Then go to Reservation Details on the new part and change the site/dates accordingly for that part, and then also go back and fix the last night of the old part.