How to get VLOOKUP to select down to the lowest row in VBA?

Question

Looking to automate the insertion of a VLOOKUP formula in a cell. When recording the macro I instruct it to populate the columns below with the same formula. Works great, howev

Answer 1

@nbayly said it, plenty of posts on this. Infact i have provided an answer to this before here:

How to Replace RC Formula Value with Variable

below is slightly modified for a dynamic range, which is what i believe you are looking for

For j = n To 10 Step -1
    If Cells(j, 1).Value = "" Then
        Cells(j, 1).Formula = "=VLookup(RC20,Previous!R2C2:R273C22,17,FALSE)"
    End If
Next j

remember to define j as long and n=sheets("sheetname)".cells(rows.count,1).end(xlup).row

replace 10 in j = n to 10 with the starting row number