Answer:
Yes, this is generally possible.
If a tower structure exported from RF‑/TOWER is recognized, all model-relevant members of this add-on module are listed in the Allocated Members section. Here, you can also find the member numbers of the objects defined in RF‑/TOWER Equipment.
If the model was created without RF‑/TOWER Structure, the member numbers can be entered manually in the table rows. You can also use the button to define the components graphically in the work window of RFEM or RSTAB.