Dynamic VLOOKUP formula in VBA procedure

Hello
I have a need for a dynamic VLOOKUP formula within a vba procedure.
I am using, ActiveCell.FormulaR1C1 = "=VLOOKUP(RC[-37],Inventory!C[-14]:C[-5],10,FALSE)"
The dynamic part is the [-37] which refers to column A.

How would I change the formula to point to Column A, no matter the cell that the formula gets put into, so it honors the proper value being used in the VLOOKUP?
Please advise and thanks.