Part Modeling > Edit Features > Split Surface > To Split a Surface Region Using Manual Selection
  
To Split a Surface Region Using Manual Selection
1. Click Model > Editing > Split Surface. The Split Surface tab opens.
2. Click to select manual contour selection.
3. Click the Placement tab, click the Split Surface collector, and in the graphics window select a solid surface or quilt to split.
4. Click the Selected contours collector, and in the graphics window select contours to copy into the Split Surface Region feature.
5. Click the Options tab and select an option:
To create several split surfaces, one for each selected contour, select For each selected contour separately.
To create one split surface from all the selected contours, select For all selected contours together.
6. Click . A Split Surface Region feature is created that you can work on independent of the original surface.