Hi @ShashankInamdar 

Thanks for the suggestion!

I would use the "Compatibility Rule" to construct a horizontal relationship.
In such a case, the concern is that the Compatibility Rule may complicate the process when processing multiple orders.
For example, if the customer orders 10 items each of Device and Plan, we only need to select one Order Line Item for each, and you only need to select one Order Line Related Item.

On the other hand, 10 Domain Orders will be generated for each Order Line Item (Device and Plan) , and 10 Product Inventories will be generated for their Domain Order Related Items.

All the Domain Order Related Items (except the one Product Inventory that will eventually be tied to the Domain Order) will need to be deleted.
I think it is not efficient to do this process manually one by one, but is there any effective way to do this in OOB?