Calculation in Shipment Consolidation

Hello ,
We are using E9.1 and we need to consolidate multiple shipments and create a new Shipment number and update this in all the related files F4620 ,F4943 and other files. I have developed a Program where we can browse multiple shipments and then select few to create a new shipment.

I need to understand how to calculate the Shipment weight , Extended Price and Extended Cost for the newly created Shipment ( consolidation of multiple shipments )

I believe its not a direct summation of individual Shipment weight , Extended Price and Extended Cost , please let me know which BSFN to use to calculate the Consolidated " Shipment weight , Extended Price and Extended Cost "


shipment No Shipment weight , Extended Price Extended Cost

1 100 10.2 20.2
2 150 15.2 25.5
3 75 8.5 14.7

consolidate above 3 shipments and create a new shipment then what should be the values in xxx below

shipment No Shipment weight , Extended Price Extended Cost

7 (say) xxxx xxxx xxxx


Thanks