Hi Pals,
Happy New Year 
As per our requirement we had four scenarios which involved two company codes trying to use the combination of BANS and NORM in General Item category group and Item category group for the same material.
Please find our analysis from MM point of view,
1. We cannot have two General Item Category groups for a single material as this data is stored at Client level
2. If we have Item category group as BANS or NORM then the same should be maintained in table T184L ( Tcode - 0184 for delivery type) to perform inbound delivery for third party sales orders scenario.
3. Also maintain Tcode - VOV4 for Sales order type, Item Category group and Delivery line item category (In Sales order item details)
4. No Customization to link between Item Category group and General Item Category group.
Please advice on the above analysis.
Thanks all for your comments
Regards,
Prabhu