Jerry, it’s been a while since the last time I worked with master projects but here’s a suggestion. Create a temporary master project by inserting the sub-projects without linking them (when you insert the project (deselect the Link to project checkbox). This will create a single project and allow you to report across all of them. You can either create the reports in a blank project or copy the report to your global to be able to reuse. Someone might have a more “formal, accurate, best practice” answer but this will at least get you the combined report you are asking.