Basic IF Function. Return Cell Value Or Show Blank

For example if I were to take the data in cells d3($358), d4($321), d5($130), d6($82) and skip a cell to now make the same data into cells d3, d5, d7, d9. Next, the data in cells f3, f4, f5, f6 would be merge into the blank cells of d4, d6, d8, d10.

The final result would look like column B. I have over two years of sales data in two separate columns that I need to merged into one column. Is there easier way without a simple cut and paste one cell at a time as this would take an enormous amount of time to complete? I�m not that good with VBA codes so a formula works good, but if VBA is the way to go then tell how to enter it on my worksheet.