I am not sure how to ask this so let me describe it.

I am working in a single workbook with two worksheets.
The first sheet is called "sales forecast" - a sales estimate by month and totaled for each year.
Each year has 21 rows.
The second is a "summary" showing total units total sales by year 2012, 2013, 2014 etc

The challenge comes when i try and create the "summary" sheet WITHOUT having to go back and forth to the "sales forecast sheet.
I have a lot of rows to capture.

Example my first line on the summary" sheet is units by year....so for 2012 I cross reference across sheets.
In cell A1 I put ='Sales forecast'!O14
The trouble is I cant copy this formula into the next cell (B1) in "summary" as the 2013 sales unit data is 21 cells below the 2012 cell.
I can absolute the column with the $ but that is only half the problem...
Is there a way to put in a formula to recognize that each data point is 21 cells below the previous one?