Hi Karthik,
If all these steps are in a process and this process is for all your materials then you can make this process generic to your all products else you can use process determination indicators where process is specific to prodocts.
Repacking can be done in DECON step itself (you can pack the HU in other HU while packing in DECON) or it also can be done using VAS step in your process and using VAS (determine the pack spec with multi level packing) you can build nested HU's.
Hope it helps and any more doubts please let us now
Regards
Anoop