Creating Money?

I am still trying to understand how you can create money and get the salary that you want when you work a regular job. I know that Brooke talks about how if you create value, then you can make as much money as you want at a job. I can fully understand this when you are selling a product or service as a business owner, but what about when you work in a job with a pay scale determined by the city in which you live? Of course, extra money can be earned independent of that job but how do you earn more within that position?