Recording and Deleting Tasks and Turnpoints in the Volkslogger

My partner and I are tripping over each other in using
the VL. We upload our tasks and waypoints from SeeYou
and want to download recorded flights for official
purposes.

VL claims it can store 25 pilots and 500 turnpoints.
Our questions are these:

1. How do we erase tasks and turnpoints from VL to
keep it simple and uncluttered?

2. (This might be a SeeYou question) How do I upload
a single task from SeeYou? ( I believe that all tasks
I have worked out in SeeYou get uploaded at once.)

3. If tasks and/or turnpoints remain in VL and it is
impossible to erase, how can I be sure I have identified
the correct task for declaration?

4. If erasure is not possible, how can I and my partner
coordinate our separate files to be sure we are not
choosing the wrong task or crediting the wrong pilot
with the task flown? (Naming or numbering tasks can
become complicated without close coordination; I can't
imagine 25 pilots in a club managing one of these loggers)

Any comments would be appreciated; I have not been
able to reach a dealer who can assist me.