You are correct. Turbotax does not support Form 3805V. You have several options:
(1) Go to a tax professional who has professional software that supports Form 3805V.
(2) Try to find a retail tax program that supports Form 3805V. (I don't think there are any, but I could be wrong).
(3) Fill out Form 3805V yourself, modify Schedule CA, Line 21 to include the NOL (you may need to override in Turbotax), but print and mail your Form 540, and include Form 3805V in the mailed return. Unfortunately, I found Form 3805V to be very confusing to fill out manually, although that is what I did
