How can subscription item be associated to hardware in sales order?

Summary: Hardware item has subscription item added under item relationship in PIM and expectation is to add the subscription item to hardware in OM automatically.

Content (required): Hi Team,

We have a requirement to add subscription/service items to sales orders. But this has to added automatically under hardware item. Once the hardware item is shipped, subscription has to be created in OSMC and asset creation to be done.

We tried adding item relationship in PIM, but subscription item is not getting added automatically. Can you please help if subscription item can be added automatically using item relation or through BOM?