If the activecell is not in the first column, it is supposed to create a new column in column A and insert the rounded-up values of the row numbers divided by 10.000. Don't really find how to insert this variable into the formula
If ActiveCell.Column < 1 Then _
Range("A:A").Insert
Range("A10").EntireColumn.Insert
Range("A:A").Formula = "=ROUNDUP(ROW(A" & rowNum & ")/10000;0)"