Knitting the front and back of sweater with circular needles

I have knit the body of the sweater with circular needles. I know says to cast off 1 st for the armhole, knit the front, then cast off another stitch. Then continue working the front and back separately. How do I work them separately on circular needles?

Just stop when you get to the other underarm then turn and work a WS row, you have to knit flat to finish them separately. You can leave the other sts on the cord, or put them on another needle or stitch holder.

I just got done doing this with the sweater I am working on now. Exactly as suzeeq says. Just knit in the round until you get to the point where you want to start working the front and back. I keep the necessary number of stitches, usually half, on an extra long circular needle and just continue workinging the front with the circular needle I’ve been using.

g’day trvvn5, nice to see another person of the fairer sex here.