# can I use a cell reference in the sum command? [closed]

I have a spread sheet where I enter the dates and amount of quotations sent out. A set of columns to the right of those is used to sum up the quotes for different periods of time. There is a 30 day column, a 60 day column.....

Whenever I add a new quote (date, amount), I have to manually extend the range of every sum function. If I have entries down to row 50, I have to go back to each Sum(c1:c45) and change c45 to c50.

I would like to be able to put "50", or "c50" (or anything) in a cell that would be referenced in each sum command to extend the column to the inserted reference. Say I put "c50" in Cell f2. I would like to have every sum look something like sum(c1:"f2"), where it would read c50 and extend the sum.

Is something like this possible?