To insert a related listing item you can start from any listing ending. Because of this there are two ways to do this.
in file
choose the listing, which you want to insertor unfold this listing and select columns, which you want to insert
or use controlled way to insert data and select in window the object which you want to relate.
in
tab unfold listing, where you want to relate a positionif you want to insert indirectly related positions, unfold relation, which have to mediate; you can do this as many times as you want
select relation with a listing, which position you want to insert
or unfold this relation and select its columns, which you want to insert
use the easy way to insert data
or use the controlled way to insert data and select in window the object which you want to relate.