Org Model Related

Hi ,

I have rather a question regarding ord assignment. I understand the hierarchy while creating the ord model is as below.

head company ->co code -> sales org ->sales office ---> sales group.

Our business requirement is to have sub group to Sales Group.

Now as per my understanding we can not have any sub group to sales group in CRM. please correct me if this is possible and how? and if this is not possible what could be way out??? we are pulling org model from ECC.

regards,

Dhruv