Well, as the title says, I've got a hard function, and I'm at a loss, so here
goes what I'm trying to code.

This function will be on Sheet20.

Where cell "F4" is found in column "M" of Sheet18, I need it to multiply
that row's column "C" by the value of Sheet1's "H1"... Let me try and type it
another way.

If Sheet20.$$ == Sheet18.M$row <--- I'm implying that I need all rows where
Sheet18's column "M" has the same value as a value on Sheet20.

Sheet18.C$row * Sheet1.H1
Sheet18.D$row * Sheet1.H2