Calculate YTD based on given criteria


Very new to Smartsheet:

I have a sheet with 14 columns. The first 12 are Jan-Dec. The 13th is the Reporting Month thru which I want smartsheet to calculate the YTD total. And the "PTD" column is the formula with the result.

Let's pretend we're in June, and I want to look back at Q1. I want to populate column 13 ("RPTMO" in image below) with the number 3 so smartsheet will add up Jan+Feb+Mar columns and put the result in the "PTD" column. In Excel I would use a helper row and then sumif, but without a helper row I don't know how to accomplish this without 12 embedded IF formulas, which is an ugly solution.

Any help would be appreciated!

Thank you!


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