What is the process to get I-94 extension if my H1?
You appear to be confusing the I-94 with the visa that is stamped in your passport. Your visa stamp may expire but the I-94 is what governs how long you can live and work in the U.S. in H-1B status. Consult an experienced immigration attorney for advice as these two items are related but only one is absolutely necessary for you continue living and working if the I-94 is almost expiring.