Can I port my priority date with NVC letter/case#???

[rcd47]

I do not have any details of my i-140 petition.

Opted consular processing while filing 140 and got approved.

My file has been forwarded to NVC by USCIS as I opted consular processing (instead of adjustment of status).

I received a letter from NVC (having NVC case #, my full name, priority date, etc,.) saying that they have my file and waiting for the availability of visa numbers (in other words my priority date should be current.)

Can i port my priority date with this letter from NVC???

And

Can I use this letter to file H1B petition for 3 yrs extension?

Thanks.