Co-Product , its self has BOM?

Hi frds

i have read mentioned link Co-Product and By-product in Production order

i am little bit confuse

In my case two materials are produced at a one time from same BOM & same production process 

1) Product A is main product & 2) Product B is  co-Product

Main product A which is packed in different Mode and Co-product B which is packed in different mode

Co-Product B will be component of BOM of main Material A as per above given link (configuration)

how I can consume  Packing materials on CO-Product B because of different packing materials are used in B case

Secondly main Product & co-product have same production Order

thanks in advance