Numbers: Keeping the same reference

Hi,

I am trying to create a spreadsheet where new data will be added regularly and I am wondering if there is a way to keep the cell reference the same.

For example, I created a table of 4x4 ColumnA-D Row1-4. My row1 will always be fixed on top. Say I want my A1 to always have a value of C2*D2. As that is where my latest data will be. Every now and then I will be adding a new row between row1 and row2. The original row2 would then become row3 and my A1's value would have shifted from C2*D2 to C3*D3, this is what I am trying to avoid. I want the value to remain as C2*D2 no matter how many new rows I will be adding in between row1 and row2. Any idea how to do this?

Thanks,

Best