Group rebar weight by its host tag

[marcomella]

Dear All,
Please support me. I am trying to group modeled rebars weights by one parameter (item tag) of their hosting element. See snap.

The “group by key” and “group by function” functionalities are not working, because can not read the list of item tag as key or function.

Thanks in advance
Marco

[Nick_Boyts]

In order to get GroupByKey to work with sublists you need to use list levels.

[marcomella]

this is exactly what i can’t achieve …

[Nick_Boyts]