I would like to know how to related three different parameters to one another. I want to parametrize City, State, and Zip fields in my web application, but I also want to ensure that if a value such as Pueblo is selected for City, CO will be selected for State and 81001 will be selected for Zip. What is the correct way of handling such a situation?

Hi,
the simplest way to solve the problem is to create three different parameter list for the three Values you want to paramatize (City, State, and Zip ). While doing so only thing that you have to keep in mind is that the values of the three parameter lists should be in the right order.
Then once that is done you can actually select one of the three parameter lists constant and select the rest two as "Same Line as **** " in the Select next row area of the parameter list.