How does one get the capital to expand their portfolio?

[Willie Murray, III]

My question is basically how does one get the bank to lend more money once you're making some type of income from atleast one rental property etc. I have a general idea, but I would like for the seasoned veterans of real estate investment to chime in on this. How much of a record must I show to the bank in order to get them to give me more money to purchase more properties?