Hi Venu,
First thing is that you or no one create inbound delivery order in EWM system, it can be IDN and then ID(Inbound Delivery).
A goods movement bin must be determined by system or entered by you to post GR, it can be determined based on your configurations (staging area/door determination) or it can also be maintained in Warehouse Process Type (i.e. GR-ZONE), same gets determined in delivery line item as WPT get determined.
Regards
Anoop S