I have Reach, and CEA, and I can't use the objects like Gravity LIft, Forerunner on my reqular maps, and I tried taking the maps I made on Reach and moving it to the CEA, and no luck. Any help on the situation?
are you talking about playing on maps like Forgeworld while the CEA disk is in, you can't. Only way you can is if you have downloaded the cea maps to your harddrive using the code you got with the game and having your reach disk in. If you are talking about why you cannot take forge objects from one map into another then you are a complete idiot and are not worth the time it has taken to post this.
Like waylander said you need to download the Halo Anniversary maps (via the code you recieved with the game) into halo reach in order to play them along with your older reach maps outside of anniversary.
The objects in the palette are specific to those canvases. You cannot take any palette object from High Noon, for example, and move them to Forge World.
Short answer: No. Only the anniversary maps on are the CE:A disk. If you want to use Forge World, you have to switch back to Reach.
That has been covered so many times in the lead up to the games release. Welcome to the world outside of that rock you've been under.