We have what could be interpreted as a multi-level BOM, however, the workorders are at 3 different l

We have what could be interpreted as a multi-level BOM, however, the workorders are at 3 different levels.  Curious as to how in discrete the workorders at the 3 levels can be grouped together to have the multiple levels be represented at the highest or "parent level".  Can the yield from the lowest level be reserved to the workorder the next level up, as an ingredient?