Your Group was no doubt established with the aid of a health-care attorney or some other person who is knowledgable about health-care laws for your state. They would be the one(s) to submit your question to.
After your Group was established as a legal entity, it should have then been established as the billing entity - by the Group contracting with specific insurance carriers. As the billing entity, the Group should have given each insurance carrier it contracted with its Type 2 (who gets paid) NPI Number. And the Group should have given each individual carrier a list of the providers who were owners and/or employees of the Group, along with their Type 1 (who is doing the work) NPI Numbers. I can't imagine that any given insurance carrier would consider the contracting process concluded without the carrier receiving these numbers.
The billing entity's (the Group's) Type 2 NPI Number goes in Box 33a of the CMS 1500 Form. The individual provider who actually did the work would have their Type 1 NPI Number go in Box 24J of that Form - but only if the insurance carrier required it (Medicare does, but many other do not).