Show and hide drop downs using conditions

how do i get a dropdown menu lets say 

option 1

option 2

and option3

when an option is selected another dropdown appears with the options available for the main option

eg

*dropdown*

colour 

numbers

flags

if the user selects colours 

*dropdown appears*

red

green 

yellow

or if the user selects numbers

*dropdown appears*

1

2

3

4

You can do this in JotForm by using conditions. I used the "Show and Hide Form Fields" condition in order to achieve this. Please refer to this guide on how to use smart conditions.

I created a demo form (http://www.jotform.com/form/52103715255952). Please check it. 

Here are the steps I did in order to get this working.

1. I created 4 drop down fields.

2. I used the condition wherein if the 1st drop down is empty, then all other 3 drop downs will be hidden.

3. Now, if you select an item in the 1st drop down then the corresponding drop down will appear. The other 2 drop down will remain hidden. The screenshot below shows all the conditions I used.

Hope this helps. Thank you.