Data shortcuts are a great tool. Recently I had an issue with a large surface I had a data shortcut link to though. The surface was very large and I wanted to reduce its size for a quicker regen time. Unfortunately, the boundary command does not work with data shortcut surfaces. To get around the surface mask command.
Here is my surface before adding a surface mask:
 Go into toolspace/prospector, expand the surface you want to mask. Right click on Masks. Select "Create Mask...".
 Select a polyline you have drawn that will serve as your new surface mask (boundary).
 The only default setting I changed is the name:
 You're Done:
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