Optimizing Business Efficiency

When I used CPlex for deciding the number of part-time & full-time resources to be employed during the four climatic seasons for the accounting department of Huntington Bank and that too with Mixed Integer programming, I didn't find a big deal of it. Because once I was able to clear off the variables, constraints, assumptions, inputs and the optimization equation CPlex was more like using any other tool or language to put my requirements into equations to get the answers which I need.

So, how far CPlex 11 is going to be more useful? Does it have it's own library functions? Are there in built equations which we can tweak for our needs?