Using sales objectives to calculate daily sales rates by month

Well -- I looked at the blue cells, and noticed that every region had a similar trend in last year: daily sales for each region begin at about .42% of annual sales in April 2015, and they increase to about .59% by March 2016.

Assuming that a similar trend might apply to the next year, I tried to mimic this trend in row 65 of the attached sheet.

Then, I applied my "trend" to the yellow cells and set up test column O23:O34 to compare with your targets in F7:F18.

And I began testing values in C65 until I found one that matched your target. I think that Solver could have done this, but it was faster for me to do it manually.

Not very scientific, I'm afraid, but perhaps it will help get you started in the right direction?

You can play with the trend in row 65, and as long as the sumproduct total at the end of the row = 100%, the numbers in the yellow cells should adjust appropriately.