While I was on TN (Canadian), I switched to H1B to apply for GC. My H1B was approved while I worked 3 months on my 2nd TN approval. Now I am on my 6th year H1B and want to claim unused H1B, which is 9 months (my H1B and TN were overlaping for 9 months).
1. Is this possible? If possible, how...