Changing sparging step profile?

Hi.  im new here ..    Great forum..      Could someone help me with a problem? 

I have been having better success on hitting my OG when I batch sparge an extra step.  I cant seem to find the beersmith mash profile for a 3rd step sparge. 
I was hoping I could get a bit of advise on how to tune my profile to fit. 

Im using a couple of converted keg kettles and a 30L cooler mash tun. 

I have been dividing my total sparge volume by 3 equal amounts manually, but im sure beer smith can do this for me.  I just dont know how.

If you open up your mash profile, in the batch sparge section there is a box marked 'use equal batch sizes'.  Make sure this is clicked.  Next make sure that the box marked as 'drain mash tun before sparging' is checked.