Help me Guys in creating 3 column independent drop down Excel sheet

[Prathamkokaje]

Help my guys in creating 3 column independent Excel sheet with drop down menu. It should function like If I've chosen one option, remaining two should be automatically filled. It's not working tried everything i can . Please can anyone share an example template. Thank you community.

[#2]

@Prathamkokaje 

Here is an example from my collection box .

It's been a long time, I don't know where I got this file from, but it has dependent dropdowns.

Maybe this will help you.