My design calls for the main area of the home (Kit., LR,DR,Office) have 12' walls and the remainder of the home (Hall, 2BR, Laundry and Bath) to have 8' walls. The cielings are sloped in the lower rooms. I have read several posts on here and replies, but I am still confused as to what to do. I know to create a box or a duplicate room, but am still confused. Any help would be greatly appreciated.Thank you.