Each month I add new data to an existing sheet. I then want to run a macro to
insert a new column and a formula. Trouble is this data increases rows each
month and I need to be able to identify the final row each time so I can copy
the formula down. ie in Jan the data finished at row 100. In Feb it finishes
at row 200. I need the macro to be able to know to copy the formula down to
row 200 in Feb for example.