How I can convert an internal volume in a solid?

[Anonymous]

Hello, I´m Spaniard, then sorry for my english.

I´d like to do something like that, convert a internal volume in a solid and delete the external solid.

There is a video that do that.

http://www.youtube.com/watch?v=oL_DOxFagvI&list=PL34AEDB28CC972E01&index=9&feature=plpp_video

Thanks.

[JDMather]

Sculpt.

Attach your file here if you can't figure it out.