Allocation from ordre release to shipment according to weights

Hi,
consider 1 order release with weight 1000lbs. for that order release two shipments were built with 500lbs each.

Now i need the table in which weight allocation is done
like
1) order release1---> total weight(order weight):1000lbs --->shipment1(allocated order release weight)-->500 lbs
2) order release1--> total weight (order weight):1000lbs -->shipment2 (allocated order release weight )-->500lbs.

I need the table info where the allocation is done according to weights. Tried with table allocation_order_release,allocation_order_release_ line but no luck.

Thanks in advance.