can someone walk me through making a style-sheet-like .PDF ?

[Molotov]

I'm trying to create a .PDF that will have form fields that can be entered by the user. That isn't the hard part (I've already learned how to do that).

What I want to do is create a .PDF with fields that are, for the most part, combo boxes. I want the selectable data in the drop-down lists to be taken from a field of data in a database. If possible, I'd like to add something like a tooltip that provides a block of read-only non-printing text by looking at what's being selected (to guide the user through their data entry). This block of text would hopefully come from a second field of data in the same table within the database.

If possible, when printed by the user, I'd like the .PDF to look at the data entered & create something like a receipt that totals up what's been entered (similarly to a spreadsheet).