It looks like all the purge options are pretty global. You do have the option to selectively purge certain sessions, but it may also purge some of your own details if you were at the same table (not a problem for observed hands though). You might try that. I haven't seen a way of removing a certain number of hands for a certain player.
OK, so if you go to the Database Maintenance And Options you can select a player from the database. It will then display all the sessions that player has played (it's sorted by start time, but you can click on a header and change it). Select the sessions you want to delete (in your case I guess the older ones) and click Purge Session(s). If you only do your observed database you don't need to worry about your own stats (including things like lifetime win/loss and stuff).
That should get you to where you want to be.
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