Create a drop-down list dependent on the drop-down list that precedes it.

[Laxis]

Hello everyone. I would like to create a drop-down list dependent on the drop-down list that precedes it.

To make it more concrete, here is an example:
On line 13 (of the Apple table), there is a drop-down list, where I can choose between "Smartphones", "Tablets", "Portal players", "Watches", "Headphones".
I would like that in line 14, if I have chosen for example "Tablets" in line 13, it only offers me to choose between "iPad", "iPad Mini", "iPad Air", "iPad Pro ".

I am a basic French speaker, and I have a little trouble with English technical terms. I tried with the help of various tutorials on Youtube, but I quickly got lost.

Thanks in advance.