wildfire config.pro option documentation for: INTF_USE_VARIABLE_SIZE            

intf_use_variable_size

yes, no

controls the size of the drawing sheet, depending on whether the imported drawing sheet size varies from the standard pro/engineer drawing sheet size and the drawing sheet size information contained in the imported files of the iges, step, dxf, dwg, medusa, stheno/pro, cadam, and cgm formats.

• yes—creates drawing sheets of different but appropriate sizes when the drawing sheet sizes vary from the standard pro/engineer drawing sheet size. the variable drawing sheet sizes are created depending on the drawing sheet size information specified in the imported files.

• no—places the imported drawing on the standard-size drawing sheet in pro/engineer.