Open Detailcenter and adjust it to a suitable size.
On the first page -Parts- we will see a list of all objects from the model such as:
-Views - these are the views created from the work frame as well as standard views like Isometric view and Complete Top View -Groups - When we created the connections, the goups of columns and beams were autmatically created and got the name of the main part. -Single parts - all parts that do not belong to a group.
The display structure can be changed.
Here the standard setting for the parts view like the screenshot above.
Changing PS Standard to Userdefined on top of the dialog allows to display the part list after different criterias such as material, position number or display class. Please mind the related options on the bottom. To list after material, the group display must be changed to only single parts.