Imo, you should be using Microvellum to create your machine code. It may be an extra cost option, but it would be the most productive option.
For cabinet production, you want the nesting and g-code creation to be as automated as possible.
Nesting and g-code creation should basically be done with not much more than a single button click.
If you're exporting files, and manually converting those into g-code, you're not using your software efficiently.