Almost perfect

I like this app to tally certain category values. I love that it remembers the values on closure. Here is what it needs though: a way to clear the numbers in the right column while keeping the numbers in the left column ( category values). This way the users category values are kept and the just the session tally or multiples are cleared. Right now the only quick erase clears Everything. Can we get a column erase option??

Shermanl about SumSheet