First a tutorial for setting up a simple conditional value list: Custom Value List? (Use option 2)
Second, once you understand the tutorial, here's a demo file where I helped another Forum Poster work out a series of conditional value list where each value selected filters the value list of the field to the right: http://www.4shared.com/file/gd6_fDgn/conditional_value_listDec.html
Thanks very much for taking the time and being so helpful! I really appreciate it. This helped a lot. What helped most was your informing me that it is called a "conditional value list".
This basic tutorial also helped a lot. http://help.filemaker.com/app/answers/detail/a_id/5833/kw/conditional%20value%20list/session/L3NpZC9DdzZrOWxtaw%3D%3D
I worked through this and then applied it to my situation.