The trick is in grouping things at their base level.. nesting groups and booleans doesn't work.. example: You group a sphere and box together (or boolean them and group), then you want to make a cone-shaped hold in the result.. what you'll have to do is ungroup the two, make them both positive (or if you're cutting out with both cone and sphere, make those negative and box positive) and group them all together at once.. Follow? You can't boolean an existing group, is sort of what I'm trying to say. =) Good luck. Rosh