About Collapsing a Range of Features
You can collapse a contiguous range of features selected in sequence on the Model Tree to create an incremental geometry feature when the range of features represents only a part of the solid geometry or one or more quilts in the model. When you select the Range of features option in the Collapse dialog box, all features that exist in sequence between the first and the last features selected on the Model Tree are automatically selected for the collapse and are highlighted on the Model Tree. The selected range of features then collapse into the target feature when you click OK in the Collapse dialog box. However, make sure that you do not select the first feature of the model on the Model Tree as the target feature.
The creation of the incremental geometric features also depends on whether the features selected for the collapse contribute geometry to a single body or multiple bodies of the part. If the range of features includes features that contribute all of the geometry to a single body or quilt, the collapse creates an independent geometry feature instead of an incremental geometric feature, even if you selected the Range of features option in the Collapse dialog box. The incremental geometry features are created when the range of features contributes geometry to a single body of the part and represents only a part of the solid geometry or one or more quilts.
If the range of features contributes geometry to multiple solid bodies of a part but represents only a part of the solid geometry or one or more quilts of the part, the incremental geometry feature that is created also contributes geometry to the same multiple bodies of the part.
If the range of features contributes geometry to a part of the geometry of a body and the entire geometry of another body or bodies, the incremental geometry feature created includes the body or bodies whose entire geometry was represented by the contributing features and completely consumed.
If you delete or suppress an incremental geometry feature, the target features remain and are not deleted though the collapsed geometry is deleted, even when the incremental geometry feature is the only contributing feature of the solid body.
If an incremental feature fails, you can redefine it using the Copy Modified Geometry or the Merge Modified and Added Geometry options on the Incremental Geometry tab.