To shape a neckline, you begin by binding off a group of stitches at the center of your sweater piece. Your pattern tells you "join a second ball of yarn" before you begin to bind the stitches off. You need two balls of yarn to work the remainder of the neckline, one for each side.
To join the second ball of yarn, simply start knitting and binding off with the strand from the second ball. When you return to shape the left side of your neckline, pick up and use the yarn from the first ball.
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