Can I combine Grouped info into further Groups


I am working on a Dashboard and grouped projects by their "Project Stage" and their Combined Value. I would then like to combine the project stages in to further groups. For example, I combined all projects with a Stage "In Progress" and the summed value of all projects at that stage. I would like to group and display this Stage with the "In Production Stage" to make and additional category.

I apologize if this isn't stated clearly.

Thank you