Hello guys
I have a problem with filtering of answers.
i have a survey about cars.
Q2 is "year of registeration of car "
Q6 is "when did you buy car "

i need to check answer 6 is greater than answer 2 ,. Answer type is dropdown list. how can i filter the answers less or greater than other answers .

also i need to do something like this ;

Q3 = what is the brand of your car ?
answer is dropdown list of brands

Q4 = what is the model of your car ?
answer is a dropdown list of models , but it must be the models of brand that we choosed


ps. my attachment is in turkish

thanks
gunes