h1b amendment

Hi,

I worked remotely full time for my employer from location A under f1-cpt status and moved to location B when h1b was picked in the lottery. I am planning to move to location C - my office HQ once h1b gets started.

is amendment required for location B since I was still on f1 status and h1b was in processing?

working on F1 CPT is completely different from working on H1B. Your status was F1 when you were working on CPT as part of your coursework.

If your H1B was filed with location C and you work in Location C, then nothing to do. Speak to your immigration attorney, who filed your H1B.