Is Visa Stamping Required Again after H1B Amendment Approval with same employer

[rkbhuvanagiri]

Hi All,

I got my H-1B visa with employer A and we have filed the visa against the client xyz. Now we dont have the client and I never traveled to USA after visa got stamped.
Now my employer had found new project for me with new client "blablabla" new location.
My employer is going to file the H-1b amendment for the new client for new location.
I have few doubts regarding this. I am very sorry if these questions already raised by some one.

1. Do I need to appear for visa stamping again?
2. H-1b amendment means will i get new petition number?
3. If get the new petition number, still my visa contains the old petition number in my passport
4. How long it will take to complete the H-1b amendment process?
5. Can I enter into US while H-1B amendment is is process?

Please do the needful.

Thanks
RaviKumar