A cascading menu isn't possible in FileMaker, but the hierarchical conditional value lists you describe are possible.
Here is a link on hierarchical conditional value lists that may help you out:
Hierarchical Conditional Value lists: Conditional Value List Question
Feel free to post follow up questions here if this link isn't enough to get your value lists working correctly.
Thank you very much! Took me a little while to figure it out but it works great now. You are the best!
Not an answer. Further question and pointer to answerers/
It's not clear if the self relationships are a chain, or if they are all related to the first occurence.
E.g. A --A 2-- A3 -- A4
If you are including relationships in an answer either include a screen shot of the relationships, or a link to a standard nomenclature field for how they are expressed non-graphically; AND include the table name consistently.