Face Pair Feature
You can select a face pair feature to edit either by indicating the existing face pair feature from the graphics screen or by selecting the appropriate feature from the Midsurface Feature Selection dialog.
Once you have selected a face pair feature to edit, choose OK and the Edit Face Pair Feature Parameters dialog appears, which lets you flip a face, add a face to a side, remove a face from a side face pair feature, or change the midsurface of the selected face pair feature.
Change Midsurface lets you change the existing definition of a midsurface. The Select Midsurface dialog shows the three options available to edit a midsurface.
