Dynamic Drop Down Fields

i want to create fields on checkout page to allow user select billing for Company or Private Person.

There is avabile an example on this website: https://www.officedirect.ro/

When click on billing Company, i need to show aditional fields.

Attached i have samples.

Please help me with a solutions.

Thanks !

fields.png

fields2.png

You cold use something like this

http://marketplace.cs-cart.com/add-ons/entity.html

or

http://marketplace.cs-cart.com/add-ons/customer-experience/hidden-fields-in-checkout.html