Copying formula from new month but not input data using fill

I've attached a file. I've used simpler explanation, but basically I've to input data into a report every month (column B), but use the same formula from the last month except referencing the new cells.

There are multiple columns in the real world, so it's time-saving to drag them all the information down from the previous 2 months to form the new month but this throws in a supposed value.

Is there anyway to copy data down from previous two rows, but leave data in one column blank?

Hi

Without knowing what the formula is it is impossible to offer advice on how to solve your problem. Uploading a spreadsheet with the formula will assist.

Cheers