I have been trying out the auto duct sizing utility in REVIT. I have a question when it comes to sizing a system. Lets say you have a generated a layout and modified to fit your needs. You go back and coordinate the duct with structural and need to flatten out a duct. I know you can set either or both a height and width restraint in the duct sizing utility and resize. Now I have had to change some of the cfm quantities for a few of the air devices and auto size again. POOF!!! duct main reverts back to square. If I "size lock" the duct, it doesn't get re-sized using the duct sizing utility. When resizing a project (floor by floor basis) is there a way to re-size the entire system with having to unlock/re-size/re-lock the modified ductwork (that's been modified to accommodate the structure)?