You can create face set features from any of the supported geometry types. To see the supported types, follow the first three steps in the instructions below to open the Custom Process browser. See
Change the type of a face set feature.
When you create a face set feature, you must define a local coordinate system. These coordinates determine where to place the face set feature when you create a pattern.
For example, we want to create a radial pattern with a simple rectangular pocket. Should the pattern position the rectangles based on the upper left corner or the lower right corner of the rectangle (or any other position)? The radius of the resulting pattern depends on the start point of the face set feature (rectangular pocket). If the radius is not changed, the pattern geometry is maintained. However, if you change the radius, the features are created with the correct reference positions related to their position to the reference circle. The directions are important so that the face set feature and pattern can react to changes done by other modeling operations (such as move faces, move by box, etc.).
To create a face set feature,
1. Click Feature and then, in the Custom Feature group, click Face Set Feature.
2. Select the type of feature; click Boss, Boss With Breakthrough, Pocket, or Breakthrough. The dialog box of the selected feature opens.
3. Select the faces of the feature in the viewport. Press Shift to select multiple faces.
4. Define the Ref.Pos or reference position. See the description above for more information about this setting.
5. Define the MainDir. This is typically the direction that would be used by a manufacturing process. For a pocket, use the negative face normal of the face the pocket is placed in.
6. Define the StartDir. This should not be parallel to the Main Dir.
7. Click Keep Blend to retain blends on the boundary of the feature, if any.
8. Click AutoDetXf to automatically detect pure transformations of the feature.
• By default, the AutoDetXf check box is selected.
• Pure transformation of face set features involves moving all the faces of a face set feature with the same transformation without invalidating the feature. You can clear the AutoDetXf check box for an instance in which, pure transformation, in combination with patterns objects , may have undesired side-effects.
9. Click BlendInval to invalidate the feature if one of its edges is replaced by a blend or a chamfer.
By default, the BlendInval check box is cleared to avoid invalidating the face set feature (see
Validate a face set feature) if an edge of the feature is modified (for example, using patterns predefined by company standards) when you do not want to automatically revalidate the feature
Face Set Feature.
Boss, 
Boss With Breakthrough, 
Pocket, or 
Breakthrough. The dialog box of the selected feature opens.
to complete the operation.