Alot of work.

First you would need the halo 3 map files.
Then you would rip the bsp and textures with adjutant.
Then optimize the bsp by your own means.
Then export to halo ce and do what you would normally do for a map.
Edited by Corpen on Oct 31, 2015 at 02:51 PM

DownLoad adjutant and use it to rip the BSP
Alternatively, you could custom model the entire thing

I will do a video tommorow if you can't figure it out.

Load up adjutant
Go to new then open your map file GOTO I thing it is tools then generate emf scripts something like that the in the window that looks like a file manager then find scenario structure then load up one of the files in the folder GOTO model veiwer then export bsp as an emf as well as bitmaps then open up Max runt the script and load the emf file.

Easiest way is to L2 Adjutant

Method:
1. Load up Adjutant
2. Press F1
3. ?????
4. Profit!



Seriously there's even a thread for this stuff. Everything is self explanatory in that program. If you cant even navigate Adjutant, I highly doubt you can port maps.

Have fun ingaming it.

There's a help section. Use it.

So hard to give him a video link?

https://www.youtube.com/watch?v=XjpWKvL8GKQ

Do some research and learn it yourself. Ask questions when you don't understand something in the tutorial. This stuff can't be taught by answering questions you have to put in the work to learn how to do stuff.