Hi Atul,
If those equipments have parent-child relationship in ECC, those will get replicated in the same way in CRM. You will have to search for equipment A in ib52 and when u will replicate equipment B, you will see it in the hierarchy of equipment A. Both will have object family '0403' i.e. equipment.
are ur equipments getting created separetly in CRM despite of their parent-child relationship in ECC? Is that the problem?
Regards,
Dipesh