Your description is not very clear, so I'll you want to know how to make cell references in formulas adjust as you copy ... make the cell references relative, i.e. remove the $ from the cell reference, so C2 instead of $C$2.
There are three absolute styles:
Reference Style and Meaning:
$A$1 = Both the column and row reference are fixed. Neither will be incremented or changed during a copy or fill operation.
$A1 = Only the column reference is fixed. This will not change during a fill or copy, but the row will change.
A$1 = Only the row reference is fixed. This will not change during a fill or copy, but the column will change.
If you select a reference in the formula, you can press F4 to cycle the reference between the 4 styles, e.g. C2 $C2 C$2 $C$2.