I'm not sure what you mean by bar increase - some people call kfb that, others use it for when you lift the yarn between sts and knit or purl into it with a twist. That's called M1R or L and instead of knitting into it, purl into it. It's easiest if you insert the L needle into the strand from the back to front, then purl into the front leg; that twists it close. Or you can do just a m1a, a backward loop, on the needle and it doesn't really show as either a knit or purl. Then on the next row knit it to keep in pattern.