Conditional & Cascading Drop Downs

There is no limit. For example you could select Make and it would be a list of auto manufacturers.

Select Toyota and see a list of Toyota Vehicles.

Select Hylander and see a list of Vehicle Categories for Hylander

Select Engine and see a list of Hylander Engine Part Categories

Select Air Conditioning and see a list of Toyota Highlander Engine Compartment A/C parts .......