On H4 and have approved H1B but never stamped or used, can be transferred later?

[anbt]

I am on H4 EAD and working for a company A. My company applied H1B on Apr,2019. While my H1B was pending with USCIS , I travelled to India on May,2019 and return back on July,2019. And my H1B got approved on Aug,2019.  So my questions are

1)  If I am not going to activate my H1B (by stamping outside the country) , My employer said that they are going to revoke my H1B. If my H1b is revoked now, can this H1B be used later to  transfer to another company B?

2) Since I never used this H1B, will there be any issue when we transfer to another company later?

3) My status is still H4 or automatically changed to H1B on oct 1st,2019?

[anbt]

Can some expert please answer this query?