B2 - H1

saltoma said:
Could somebody that is with tourist visa change to H-1 status without leaving US?

Doing so may have repercussions later on for your green card petition or H1B stamping in your home country.
 
B to H

Most probably you get a new H1B approval without a I 94 extension at bottom.

In this case you do not have any status in US. You have to go out and get your visa stamped and enter usa. While entering you will get your new I 94 that is your valid status in US.
 
Stamping

Can we go Canada and get stamped? Or we have to go home country for stamping?

great guru said:
Most probably you get a new H1B approval without a I 94 extension at bottom.

In this case you do not have any status in US. You have to go out and get your visa stamped and enter usa. While entering you will get your new I 94 that is your valid status in US.
 
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