How to combine routings when an assy is marked as phantom ?

Hello friends,

Currently we have two level BOM, i.e. FG -> SFG -> Raw Matl. SFG has BOM and Routing. If I mark SFG as Phantom, the components of SFG BOM are added to the production order for FG. However, the routing in the production order is still the original routing of FG - i.e. the routing of SFG is ignored. So I need your help - is there any way we can have routing of SFG also get added, as preceding operations before the FG routing, in the production order ?

Thanks for your help,

- Chetan