General question in Case Branch (OIR)

Hello Everyone

I want to create a product number based on attribute selection.

On selecting the attributes the product number has to be created automatically choosing the number given for the particular attribute.

For example:

Customer No.       Product Family     Running No.

      XXX                         YY                    ZZZ

If the product attribute selection be like 032(Customer no.)12(Product family) 322(running no.)

The auto generated number should be like 03212322

I'm able to create the numbering schema for customer name using case branch in OIR. But I have no clue in combining both the customer no. as well as product family (XXXYYZZZ)

Can anyone help in this?

Any help is greatly appreciated.