Building with the Frame Generator - Inventor 2013 and Inventor LT 2013 Essentials - page 256

FIGURE 11.13 Changing the family of a frame member
FIGURE 11.14 Edits to frame members are updated by
changes to the frame sizes
For all but radical changes to the family of a frame member, the end treatments
should be maintained. This is also true for most cases when the skeleton of the
frame is changed.
Changing the Frame Skeleton
The great advantage of using the Frame Generator over creating individual parts
based on extruded profiles is the association between the frame members and the
skeleton of the frame. A change to the skeleton updates the members of the frame
rather than requiring you to edit individual parts one at a time.
1. Make certain that the 2013 Essentials project file is active, and then
open the c11-10.iam file from the Assemblies\Chapter​11 folder.