I cant seem to solve a problem that I been working on.

I want to know how to fill formula down rows but increment column.


Here is what I have

I have in cell D4 have =C4*Who!AR1
I have in cell D5 have =C5*Who!AS1
I have in cell D6 have =C6*Who!AT1


and I want to increment C6, 7, 8, 9... on and Who!AU1, AV1, AW1, AX1......on.

Please help.