Conditional logic (add user) and add (another user)?

Hi,

i have this form

Basic form

[name field]
[adres field
[etc...field]

[radio buttons 'add another user']

--------- Section break ----------

Extra user

[name]
[adres]
[etc]

This works fine. When i click the radio-button the fields of (Extra user) opens.

But now i want another radio-button [Add another extra user]

If you select this radio-button the 'Extra user fields must open again and again...

So you can continuously add a new user.

How do i repeat and integrate this with the Conditional Logic structure?