It's not really four separate strands. It's actually a reversible cable. Just like the last reversible cable, it's done in ribbing. To give the appearance of a four strand braid all you have to do is use the basic recipe.
You could work in any even numbered amount times four. I did a six stitch grouping so the total number of stitches on my needle was twenty four. Each group represents one strand of the braid.
1)First cable crossing: front cable, front cable.
2)Work even until you reach the ...
3)Second crossing: work one group even, back cable, work one group even.
4)Work even until it's time to repeat from (1)
I love cabling. It's so much simpler than most people would believe.