How to add Multiple Radio Button under each other

[Naveen87]

Hey Guys,

I have a requirement , Where i have to field == Desk phone.

When Desk phone is selected , 2 radio buttons should be appear. A and B.

When A is selected , it will have C and D under it.

How to achieve this??

Please suggest.

Thank you

[Naveen87]

I tried this but isn't working.