>. So I want my chord sc 17 to trigger my 700 >and that to fire my 600. I'm not figuring out how to >accomplish that....
As others stated, the SC-17 is a hot shoe extension cord and the SB-700 should work when attached via the cord as if it were on the camera hot shoe.
I have an SC-29 and two SB-800's and just tried doing what you wanted and it worked (well at least on the second try that is). The reason it took two tries is that I got tripped up in that I set the SB-800 attached to the SC-29 as a master, but overlooked the fact that the SB-800 by default is set to Channel 1 whereas the camera is set at Channel 3 by default I believe. So the remote SB-800 on the first try didn't fire (being that I have them set to work with the camera on Channel 3. Once I changed the remote SB-800 to Channel 1, it worked like a charm!!
So if your cord is not allowing the SB-700 to work as a master, perhaps there is a broken wire as George suggests.