Is there an existing product for double access/open thru cabinets that I might be missing? If not, what would be the best way to make one?

I am currently trying to use an existing product in the library, deleting the back, and adding a door sub assembly.. but my sub assemblies do not work the way any training videos show. They come in at random points, backwards, or not show at all. The dado does not adjust accordingly when I delete the back as well..