Hi there. I am really new at knitting and I am attempting to knit a sweater for my baby. I am working on the Tricolor Ensemble by Doreen Marquart. So the pattern says to do 5 garter stitches in blue at the beginning of the row, switch to green do the row and then go back to blue for the last 5 garter stitches in the row. Do I cut the blue yarn every time or do I pull it all the way over from one end to the other, how do you do that? Thanks.