If I have a dataset of 100 rows and 13 columns (1st column being the non numerical data-columns 2-13 would be numerical by month), I was wondering how I could get a formula to add several rows and columns at once based on the number of months. For example in January I would add Column 2 only and in Feb add columns 2&3 and add a column each month (based on the number of months-which would be part of the formula). I know this can be done if the data is all in one row however I was wondering if this can be done if the data is in many rows. For example if I had 30 rows of "ADL" as the criteria in March I would want to add all 30 rows in columns 2 3 and 4 (Jan-March). Does anyone have any ideas?