How to setup California as "origin sales tax" state.

[tikitekki]

California is a "origin sales tax" state, meaning that if you have a presence (head quarters, physical location") in California then all sales, regardless of where the person purchasing online is, must be taxed at the California sales tax rate. How do I set that up? I've setup sales tax for California but if the buyer puts in an address outside California then sales tax is not added. I see an option to setup the entire country of the U.S. with a single taxable rate, is that how I would do this? That doesn't quite seem correct to me.