Changing Selection Path

I have an issue in finding some information.

I want to put in a Customer Name. Lets Say Joe Bloggs.
This belongs to a group of Customers. Let’s says code 0006

I then want to see detail about every customer in group 0006

Input
Joe Bloggs

I need my Output to be
Joe Bloggs          Credit Limit £5,500     Group Code 0006
Joe Bloggs Scotland     Credit Limit £10,000     Group Code 0006
J Bloggs. Inc          Credit Limit £5000     Group Code 0006
Joseph Bloggs          Credit Limit £20,00     Group Code 0006

Not all Customers are part of a Customer Group. So if there is no Group, I just want that customer

So how do I get Crystal to see if there is a Group Code for a Customer, then show me all the customers for that code, but if there is no Group code, just show me that customer.

Any help would be most appreciated.

After a good nights sleep. It was obvious. The main report shows the Customer, then i pass through the Group Code ( if there is one ) to a subreport.

The subreport then shows all customers in that group.