I did it!
I'm working on a ski sweater that called for me to duplicate stitch part of the pattern that would normally be done intarsia because it is in the round.
I didn't wanna. After some research, I learned how!
The first row of the color pattern is no problem, nor is every other row after that.
The problem comes on the odd rows, when the yarn is at the wrong end of the pattern. When I did these rows, I knit the stitches that were part of the background for that row and slipped the colored stitches. Then I turned the work and purled the colored stitches and slipped the background stitches that I already knit. Once all the stiches in that section are done, I slipped the whole section back and continued on my merry way.
Best of all---no sewing!