How to change the units in Catia in the drawing. When I do the piece I set the units in mm. But when I do the drawing it changes to (in). I think there is an option to change this Not manual, but if automatically
If your page standart is ASME or ANSI, your dimensions are inch.
If you select ISO, you will see dimensions as mm.
So when you open a new drawing page select correct standart.
Or go File-->Page setup and change your standart as ISO.