In custom properties, of sheet-metal part, I have a property called "Dimensions", which represents the flat pattern dimensions, of the part.

Normaly, I select the Width and Height dimensions, of the part, to define this property (i.e.: "W@SKBase@Part1.SLDPRT"x"H@SKBase@Part1.SLDPRT")

But, now I need this property for the un-folded configuration, of the Sheet-Metal.

This property must be only in the "Custom" part of the Properties window, and not in the "Configuration Specific" part.