No. If it is Perm, not necessary. If NIW, required.
如果我想保留PD的話需要注意哪些東西?
Nothing. Just 140 approve notice.
However, you need make sure you have enough time to extend H1 if your H1 reach to 6 years. Such as, your new PERM need start at least 1 years before your 6 year H1 expire.