Is there a way to make elevators in doombuilder2?

I don't mean like a simple linedef action where you can lower the floor or the ceiling of a given sector. I want both to lower at the same time so the whole "box" you're in lowers instead of just the floor.

Any help would be great.

Yes, use the "elevator" action in ZDoom. Here's a simple wad that demonstrates it in action.

http://www.mediafire.com/download/dfd1rmjx7xb8plz/demo3.wad

Just like with lifts, you're going to have to specify textures that DB2 doesn't realize your map needs.

You should also look into http://zdoom.org/wiki/Linked_sectors if you want to make an elevator
from 3D constructs for floors and walls of the cage.



[edit]
forgot to mention Rex's tutorial
http://doomnexus.drdteam.org/Tutorial/elevator.html

Since you only got ZDoom related answers so far, please don't forget that if you have such questions, always mention the port you are targetting!

An action as you describe has first been implemented in Boom so if you want to target anything lower you are out of luck.

It's amusing how these editing questions always focus on the editor, rather than the port.