What I'm trying to do is add the gold containers from the 'GoldCoinBagger' mod to a player house I'm using. Would have used the decorator assistant, but it drops fps way too low when lots of things are stacked on top of eachother. Decided to just use the CS instead and edit the player home. Anyways, I activated both in the CS, and set the player home as the active mod. At first I thought it was as simple as just dropping the items from the object window to the view window and placing them how I wanted. Hoever, after I saved, and loaded the mods back into the game, None of what I placed, showed up either in the game or after it was reloaded into the CS. I didn't see anything in the CS wiki tutorials about this, unless I managed to miss it somehow. Any help would be appreciated.
You can not use items from one .esp in another - they will not show up in game as you found out - Since you can not be sure which .esp will load first and if the wrong one loaded first the game would crash when it tried to find a non existing item (doesn't exist yet since it has not been loaded from the second .esp) - you have a couple choices and what the item is will decide which is the best\easiest to use.
1.) create new items using the Nifs etc. from the other mod in your player home mod (this is easiest and normally used - unless say they have scripting that you also need to use)
2.) change the other mod's .esp file to an .esm (see mod deisolation on the wiki) - and then load both the .esm and the house mod in the CS with the house mod as the active file (you can then refer to items from the other mod (since .esm files always load before .esps) - this will have some side effects though since your house mod will now always depend on having the other mod as well or the game will crash if you try to load a game without that other mod active.