Do you have to register as a foreign entity with a Parent LLC?

[Billie Joe]

Do you have to register as a foreign entity, to have 1 LLC (from another state) own the LLC in your state? Or can you register them separately and have the details worked out in an operating agreement?

Also, do you have to capitalize the parent LLC?

The answer might seem obvious, but this is my first rodeo. Anyone so kind to answer, would be greatly appreciated :)