Then if it is a sweater that seems to make sense sort of, generally when you get to the decreasing for the armholes, though you separate and knit back and forth, but if this is just shaping and not at the armholes I think that the above makes sense. So starting at the beginning, first stitch would be K1, then continue k2tog, knit across to 3 sts before next marker, ssk, k1, marker and do it all over again!
Wow, I hope this all helps.