Grouping Objects

Some objects are groups of other objects, and when you move them, they move as one group. For example the tavern table, when you move the table, the chairs move with it. I love that functionality, but if you make any modifications to any of the components or replace some of the underlying objects, they don't move like that anymore.

I would like top request the ablility to select multiple objects, and group them, so they will move as one. It would also be nice to be able to delete and duplicate the whole group as well.