I'm trying to figure out how to create an online form where users can log into the back-end and enter in their car details. I've tried some of the plugins out there like ninja forms and gravity but they don't seem to do fully what I need. I can get the form listing the year make and model but the problem is that not all make and models were created for a given year and I can't see to get that portion of it setup. Example: A Honda s2000 was only made during 1999-2009 so when select 1990 from the drop down and select Honda, the S2000 model should not show up. Along with this, I'd like to be able to include the engine setups and other parameters specific to that car. Can someone point me in the right direction?