Knitted sweatshirt yoke instructions.

I owned a shop in Cleveland, Ohio in the 80s and we did so many sweatshirt knitted yokes. I guess I neglected to save the instructions. You cut out the circle yoke in sweatshirt and then knit it back in with leftover yarns. It was so much fun and I have so much leftover yarn. I just need the knitted yoke instructions for the decreases. Would appreciate your help. THANK YOU KNITTING FRIEND, Bonnie