It sounds similar to a 3 needle bind off although without the bind off step. This video shows you the technique. You would continue to knit sts onto the right needle without doing the lifted bind off.
Are you knitting in the round? In that case it would be easier to have both the live sts (with the working yarn) and the sts from the provisional cast on, on circular needles. If you're working flat you could use straight needles assuming they can handle the number of sts.
What pattern are you making? Can you give us a link or the name of the pattern?