Applying a formula to many rows

[kbb23]

Hello, I have a spreadsheet with over 100 rows. I can apply a formula to calculate a sum for each row but with quite a few rows it could be time consuming to do so for each row, changing only the row letter in each sum. I am guessing there is an easier way?

Version: 7.0.6.2 (x64)

[Hrbrgr]

Select the cell of the first sum.
Grab the bottom right corner (small black square) and drag it down.

[kbb23]

Ahh, perfect- Thank you very much!