okh, thanks for reporting the issue in furniture table, it should be fixed in Beta 6.
Thanks, but I am still struggling. Now, in the file I sent you, if I CUT the garden hedge into the GROUP, the Vegetation GROUP closes and cannot be opened with the plus sign. And I cannot find a way of opening it to paste the garden hedge (Paste to group is greyed out for Vegetation). But I do manage to paste the Garden hedge to the Roof GROOP. After careful consideration, though, I think having the Garden hedge on the roof is a sub-optimal solution 
But maybe my file is messed up, I will try again tomorrow. ok
