I need to set up nested selections in Zoho Forms but can't see anyway to do this.

For example:
1.0  Type of Material

[  ] Wood

     [  ] Oak

     [  ] Walnut

     [  ] Ebony

[  ]  Glass

     [  ]  Clear

     [  ]  Green

     [  ]  Brown

So the Field is Type of Material.
Select Wood and then  Oak/Walnut/Ebony  become active/selectable

Select glass and then  Clear/Green/Brown  become active.

Is this possible in Zoho Forms?