Dale of Norway Cardigan pattern

[Bammie]

I am working on a cardigan from the pattern book Dale of Norway. I am having difficulty trying to figure out how to do the back and armholes. The pattern has you make the body first, then cast off for the armhole, work the next 120 stitches and then cast off for the other armhole.It says to continue to work back and fronts separately. The next step in the instructions says Back & armholes: Cont pattern as set, cast off 3 sts at the beginning of the first 2 rows, then cast off 2 stitch's the next two rows, then cast off 1 stitch off the next 8 rows (102 stitches). It then says to continue working until armhole measure 7 1/2 inches. When I start the row and get to the point where I had cast off for the armhole there are only 60 stitches. My confusion is what do I do when I come to the place where I did the cast off for the armhole. Do I turn the work and work back and forth? If so, that does not give me all of the 102 stitches. I have read every book I can find and searched the web looking for some help . Help