Bow Coat Question

Knit Simple magazine, Fall 2009, on page 73, bow cardigan. Pattern says,:Left front, co 30 sts, rs knit, [B]ws sl 1 purlwise[/B]. Continue as established. Ques. do we do this on every row??
On the 24th row dec 1 st at side edge beg on RS rows. Q: do I Sl 1 purlwise on that row also with the decrease.
Thank you all very much,

Maybe you only slip on the WS rows. And if you’re slipping a stitch that’s part of a decrease, slip it knitwise or it’ll be twisted.