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Not to sure of what your wantin but, here are two type knots that may be what your lookin' for? Also, ya' might check out other knots that the link has.
As in the fly fishing kind for adding droppers to your cast? There are a few ways you can do it, firstly the simple version and its easy to tie.
SNAP SWIVEL. Get a 20# test swivel and tie one end to the loop on one end and then hook the swivel onto the rig.