Maybe simpler...
In the adjoining column enter 12.1, 24.1, 36.1 in the first three cells.
Select the three cells and fill down to about 350 rows below your data.
(4000/12 =333)
Select both columns and sort by the new column.
Clear the new column.
--
Jim Cone
San Francisco, USA
http://www.realezsites.com/bus/primitivesoftware
(Excel Add-ins / Excel Programming)
"Sarah"
wrote in message
I have about 4000 rows and need a new, blank row every 12 rows.