The short answer is that appraisal licenses are not like driver's licenses. They aren't portable and they only apply to work performed in the jurisdictions where the license was issued.
If you're talking about performing a single assignment in Nevada you can apply for a Temporary Practice Permit. The process varies from state to state, but usually involves filling out a couple forms, paying a small fee and demonstrating to them that you are a licensed appraiser in good standing in your home state.
If you're talking about doing appraisal work on anything other than a one-time basis, you'll need to obtain a state license in each state you want to do business in. Each state has its own requirements, and they decide whose licenses they will and won't accept. If you look on the OREAs website (you can follow the "Appraisers Links" button above to State Appraisal Boards) they have a page there that deals with "Reciprocity" and a list of states that will accept your California license as proof that you have the minimum level of education and experience to qualify for their license. Again it varies from state to state, but the idea is that you submit your application and pay your fees, they check up on your license status and assuming all goes well they'll issue you a license for their state. When doing business in their state under their license, whether it's a Temporary Practice Permit or a permanent license, you are subject to their rules and their jurisdiction.
By the way, according to the OREA's list, California does not have reciprocity with Nevada. Kinda sounds like North Carolina and Virginia, doesn't it?