Excel Version: MS Office Professional Plus 2013

I am writing a macro that uses the same function "Cells(firstRow + j - 1, firstColFinal)" multiple times.
firstRow and firstColFinal are dynamic values, and j is from a For loop.

Is there a way to define a part of the script as "DIM X as Script" and simply put "X" in the code instead of this longish Cell(#,A)?
Or would I need to type this out each time I need to use it?