BL CO underarm question

[reeny]

When you CO extra stitches in the middle of a patter, for example at the under arm for a top-sown raglan sweater, are you supposed to CO to the left needle and knit them immediately after casting on, or do you CO to the right needle and knit them on the next round?

[suzeeq]

CO to the right needle where the yarn is, continue to knit the round, and those new sts get knit on the next. I use knit or cable CO which means switching it to left for the CO, then back and knitting around.