I have a dynamic table that calculates the sum of all rows, no issue. I'm struggling with pulling out a subtotal though. I would like to have a check box in each row that flags those rows and gives the sum of their total. Any help would be greatly app

I have a dynamic table that calculates the sum of all rows, no issue.  I'm struggling with pulling out a subtotal though.  I would like to have a check box in each row  that flags those rows and gives the sum of their total.  Any help would be greatly appreciated.