In reply to Bee_1:
Hi. I raised this very question with MTUK, and the reply was that yes, you should enter it into all relevant sections. So if you do, say Grooved Arete on Tryfan, then Bristly Ridge, then walk over the Glyders, enter Grooved Arete under rock climbing, Bristly Ridge (and South Ridge of Tryfan!) under scrambling, then the whole thing under hillwalking as a QMD. A bit of a pain, but that's how they want it!
Graham