Stock Investor Pro has plenty to offer for individual investors looking to perform fundamental analysis for long-term investing. However, no matter how powerful a stock screening program is, inevitably there will be data fields that are not listed. If you find that a data field of interest is not included in Stock Investor Pro, fear not. Users have the ability to go beyond the thousands of data points available for each company by creating their own custom fields. These custom fields can then be used for screening as well as creating custom views and reports. One feature that many users may not be familiar with is the collection of mathematical expressions that is available to perform more advanced calculations. Here we discuss how to utilize some of the more useful expressions.