How to make objects float

1. First you get an immovable object ( double box, single box, wall ect. )
then you put it in the air and save your map and end the game
easy as that and the immovable item will be in the air

Or

2. You can also stack up crate or double boxes ext. and put the immovable item on top and delete objects under it and it will still be floating

Or

3. If its not an immovable object then stack up boxes then put a portal or wepon holder on top then you put your movable object on top of portal or wepon holder and then put another portal or wepon holder on top of movable object and it will be floating and almost impossible to push out

Hope this helps
If you have any questions just ask

remember that the first and second example only work on the DLC maps the u have to use the third example on the origanal maps that came with halo 3