I am looking to create a barrel vaulted ceiling down a hall. What would be the easiest way. Additionally I would like to create a crossvault intersecting at 90 degrees. Anyhelp would be appreciated. please contact me at josh_carter@yahoo
There's a demonstration of what I think you want to do in the help section of ArchCAD. Go to Help and type "vault roof" into your help search facility. Click on "Cutting with the marquee tool".