if you don't mind sorting:
what if in a column X you type:
1
2
3
copy and paste it to the end, and then sort by the column, you can then
delete all rows with 3 in column x.
Don Guillett, yes I have tried your solution and it worked, but I coul
not understand the logic behind the script and when I need to delet
every 2+3+4th row for example I am unable to. Thank yo