Override theme

I have a primary theme I am using. I need a custom page that I only need the page breadcrumbs and the content that is normally displayed in the product information tab.

The product is of type grouped. I have tried to create a new grouped.phtml file but not having any luck. I have also enable the template path hints. Perhaps my issue is that I need a new layout file instead of a new phtml file?

Any help would be appreciated.

submitted by /u/davidbarman
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