To Exclude Surfaces and Outer Loops
The Exclude option is available only if you gather using an option other than Surf & Bnd (for example, Surfaces). It allows you to:
• Surfaces—Exclude some of the chosen surfaces by selecting each of them individually. This is especially convenient when gathering using Features or Mill Surf.
• Loops—Exclude outer loops. Use this option to delete unwanted portions of surfaces selected for gathering.