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It seems to me that you mean you want to figure out and total up how many submissions you have for each of your received form submissions.
The best way I can think of to do something of this sort would be to create a visual report.
Doing this would make it so that it is displayed via graphs for each of your categories so that you can see at a glance the totaled submissions for your categories in real-time as they are received.
Here's the demo form's visual report (chart): https://www.jotform.com/report/60684443220046
You'll notice that it's charting the categories I set for 3 received test submissions.