Thanks Beethros - you're a star! :-D
Opps, I just read your P.S.! Actually, this is where the situation is difficult - the land is bigger than that, and if I can't use my tier towards it, it will push me into the 8192 tier instead of 4096. This is why it's important to me to know whether my basic tier will count if I withdraw it from the group.
Yes, I would have preferred to buy existing land on behalf of the group, but this particular piece of land at auction is what the group would like, and I agreed to do it this time. It's fair, because others have done it in the past, so I don't mind, but of course I want to keep the tier cost as low as possible.
Your "beenglish" is super-good, by the way, and I can see you've offered help to many people in the forums. You're still a star! :-D