So you have basic k2, p2 ribbing. After you BO continue the row in the rib st. Then when you get to the next row after the 2 with bound off stitches, you will have to knit the knit sts and purl the purl sts instead of starting with k2, p2. You would start with the 8th st (because you bound off 7) which is a p1, then go back to k2, p2.
I hope that's what you mean.
sue- knitting heretic