Katie, if you are using VWA, with units set to millimeters, and you choose Model|Select wall Type|Add, the default is set to inches.
I would also have to add, that all the pios have the units in mm, but they have been converted from inches. So, a 24" wide counter top, makes a logical starting point in the USA, but for metric users, 609mm requires changing. This probably sounds trivial, butremember it applies to EVERY part of EVERY pio, so it ends up taking a lot of extra steps. I don't know what the answer is to this without a heap of work from you guys. Except maybe if the VWA PIOs were editable by the end users, at least we could do it once to the PIOs we use the most.
Thanks