Set values of dropdown list based on value of another field

[ys]

Hello, I'm not too sure how to approach this problem.  I want to have 2 fields (A and B), where field A is a text field and field B is a dropdown menu.  Now, I want to use field A to determine the list of possible values that field B can contain. So for example,

if field A = "x", field B = {1,2,3}

if field A = "y", field B = {2,3,4}

if field A = "z", field B = {1,4,5}

etc...

Is this possible with scripted field perhaps? 

[Jack Brickey · Accepted solution]

you just need to create a custom field of type Cascading Select.

[ys]

Oh, the answer was easier than I thought. Thanks :)

[Clara Martinez]

I create a field of that type.  I was expecting to be asked for the values to populate both dropdowns.  How do I do that?