H1b Amendment is approved

Hi,

My H1b amendment got approved for new location and new role for 3 years until 2023. I will be applying for extension in October because my visa is expiring March 2021. To avoid going back India if my extension gets denied, can I get my i94 extended by showing latest approved amendment petition at one of the CBP offices in Mexico or Canada. If yes, can I just show approved petition and get it updated or I have to book interview like We do for stamping in India.

Was your amendment approved with consular processing?

Why do you want to get the visa extended? What’s your purpose?