It could be that (assuming you're using the latest version of Numbers and you previously used iWork '09) the functionality has been removed or moved. Plenty of people complained that things were no longer available but it was just the case that Apple had moved them!
Also, you won't be able to open the document with iWork '09 if you've already opened it in the latest Numbers and you will have to restore from a backup.
As I'm not familiar with the functionality you've lost I can't be of much more use ...
Stephen
We are Costa of Borg. We will add your vibrancy and distinctiveness to our own. Your town and your customers will service us. Resistance is futile.