H1B visa stamping before existing visa expires ?

[nsatish30]

Hello guys,

Existing valid visa will be cancelled if we go for stamping on newly approved petition ?.

1. if visa validity is less than a week then VO will cancel the existing and will decide issueing visa on new pitition.

2. if visa validity is > 2 months then VO wont cancel the existing visa while stamping ....

Is this true ?

Please share your info....

Thanks in advance