Amendment raised due to non stamping of VISA. Now how to proceed for stamping with new client documents

Hello,

When i went for stamping, as i was not having client letter my H1B was went to administrative processing.

And my VISA team has changed my petition by an amendment with change in client and location with new LCA.

Now, whats the procedure to go for stamping and i heard that untill unless you clear old reference in US consulate, you can’t apply for new VISA stamping.

Can anyone suggest the procedure please.

Thanks and Regards

reddy