I'm very confused as to how to setup Beersmith for batch sparging. I understand the process of batch sparging but not how to get Beersmith to create the preboil volume which is produced from 1) a Mash volume (plus an additional amount of water to compensate for grain absorption after the mash and before runoff); and 2) a sparge volume. The 2 runoff volumes from 1) & 2) are equal. Here is the general batch sparge description from Denny Conn's website:

"Letâ€™s see how this works in a brewing session. Assume a recipe with 10 lb. of grain, and that you need to collect 7 gal. of pre boil wort. A mash ration of 1.25 qt./lb. would require 12.5 qt. or 3.125 gal. of strike water. Based on an absorption of .1 gal./lb., the mash would absorb 1 gal. of water so weâ€™d get 2.125 gal. of water from the mash. Since we want to collect 3.5 gal. (or 50% of the boil volume), after the mash is complete weâ€™d add 1.375 gal. (5.5 qt.) of water to mash tun before the first runoff. Stir the additional water in, let it sit for a few minutes, then vorlauf until clear and start your runoff. After the runoff, we add 3.5 gal. of batch sparge water. Stir it in well, then vorlauf and runoff as before. These two runoffs will give us our pre boil volume of 7 gal. of sweet wort."

Preboil 7 gal

Mash = 3.125 gal

After mash add 1.375 gal. of water to mash tun before the first runoff

Runoff = 3.5 gal

Sparge with 3.5 gal

Total collected for preboil = 7 gal

I selected Single Infusion, Medium Body, Batch Sparge for the Mash Profile. Under the Details I have tried all the various check boxes for batch sparge and get different answers but none that produce equal runoff volumes. Selecting equal sparges gives you equal sparge volumes but does not provide for equal runoffs (from the Mash and Sparge). Changing the percentage of mash tun volume does not help.

Any help would be appreciated, thanks!