Answer:
The sets of members to be designed in the add-on module must be based on the same or the consistently running cross-section.
An exception is a set of members consisting of ribs. This only results in an identical cross-section if the integration width of the rib is selected to be the same. Thus, there must be a single rib type for the entire set of members.
Tapered sets of members are only designed if the entire set of members has a linear cross-section diagram.
