I have read somewhere in this Forum that once u get canadian passport your Indian passport is cancelled ,wanted to know how can u use that indian passport with a valid H1 to enter or leave US one it is cancelled.

Take your indian passport , cdn passport and I-797 to the US POE and you will get a h1-B stamp (not a visa ) and a new I-94 on your cdn passport till the validity of your I-797

Then you are good to go

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We will find a way or we will make one

Thanks