Reports by Group not just category

I am only 2 days in but so far I am loving this app. One thing I use a lot (and maybe I am missing it) is in the REPORTS section - while I love being able to see what I am spending for each category, I specifically like to see what I am spending on each grouping within a specific time frame. Maybe some sort of a toggle button to go between?

For example - CAR is the group, but within the group are categories such as GAS/PAYMENT/MAINTENANCE. I can see the time frame spending on each but not as a specific group.