multiple flash sync help required
SB800 and SB900 and SB910 all have SU-4 mode which is just an optical trigger. Set this on each of your remotes and set these remotes to the output level you want. Then set your on camera flash to a low power Manual output. This should work.
Alternatively, you can use the commander method described but two of your remote flashes will need to share a group and consequently the output setting.
Theres only one sun. Why do I need more than one light to get a natural result?