About B1/B2 Stamp & Old passport

Hello Kumar/Saurabh/Experts,

I had a B1/B2 stamp that was processed by an Indian Offshore company(No Annotation/company name in that stamp & its valid for 10 years, i.e. till 2019).

1.Can I use that stamp for future travel as Visitor on B2 Visa?(Can I use the same stamp for B2 Visitor category?

2.As of now, since my old passport which has that B1/B2 stamp is expired, I have got a New Indian passport.Can I use ,y Old Passport & travel in future as a Visitior on B2 Visa…? Do I need to go for B2 stamping again if required to travel on Visitors visa?

Appreciate ur response,

Thank U

1- You can and should use old/current B1/B2 visa.

2- carry both old ppt with visa and new passport for travel.