Pattern says the following for collared cardigan:-

Shape shoulders cast of 15 still at beg next 2 rows leave remember 15 on St holder.

For V necked cardigan (which I’m doing) it says cast of centre 15 still for back neck.

My question is do i do that just once or over 2 rows so I end up with just 15 sts still?

How many stitches do you have on the needle before the bind off of 15sts at the beginning of the next 2 rows? What pattern are you making? Can you give us a link or a pattern name?

Unusally, there is only a single bind off of the center 15sts for the back neck.

Thank you for the response, after sitting here for a hour I finally figured it out lol.