Can I travel on B1/B2 after H1 stamping

[NBK4]

I currently hold a B1/B2 and have travelled to US on the same. Soon I will be getting my H1 stamped for a US employer.
1. Now after the H1 stamping will my B1/B2 be vaild or revoked ?
2. Assuming it will be vaild , if I travel on the B1/B2 (for business with current employer) at the port of entry would the officer revoke my H1 ?
3. After coming back can I travel on H1 ?

[Subramanya]

H1 and B1

I currently hold a B1/B2 and have travelled to US on the same. Soon I will be getting my H1 stamped for a US employer.

1. Now after the H1 stamping will my B1/B2 be vaild or revoked ?

---- NO, the B1/B2 Visa will not be revoked

2. Assuming it will be vaild , if I travel on the B1/B2 (for business with current employer) at the port of entry would the officer revoke my H1 ?

---- As above. At the POE declare on which Visa you wish to enter US

3. After coming back can I travel on H1 ?

---- Yes, at the POE declare your intention of entering US on H1

Subramanya