如何申請2nd H1B?????????謝謝

如何申請2nd H1B?????????謝謝

在學校A工作（H1B已收到)，暑假想在另一個學校B做part time instructor，請問能申
請2nd H1B可以嗎？謝謝。
In addition, 學校A will pay me one month salary in the summer. is that a
duplicated salary if I am working for School B at the same time in the
summer.
Thanks a lot.