The stitch is worked in CC1 held triple. Divide CC1 into three separate balls.
As you work, change yarn balls for each chart and check the remaining yarn in each ball so that all three strands can be held together when working Chart 3.
Following the chart, bring CC from back of the work to front. Work the specified number of stitches in MC. Bring CC to back of the work. Repeat these steps according to the chart. This is not working a stitch with CC. A stitch is wrapped with CC, and it features looks like embroidery. Be careful not to hold CC too tight.