I am not a VBA programmer by any stretch of the imagination. I am here to
ask for help with a macro that I _recorded_.

Part of what my macro does is:

Insert a column in a sheet of data
Type a formula into the top cell of the new column
Copy the formula down the column for as far as there is data

I did this last step by double clicking the fill handle and this is the code
that is generated

Range("B4").Select
Selection.AutoFill Destination:=Range("B4:B450")
Range("B4:B450").Select

That's OK this time, but what about when there is more or less lines of
data.

How can this be changed to accomplish what I am looking for?

Thanks,
Carlos