I currently have a genosis map made from the shipped world's odf's. Then I tried to place naboo props into the same folder but when I try to place it in ZE it doesn't show up.

How do I have different world odf's in the same folder ?

Mhh, I'll answer in this one of your three topics

All of your odfs go in the same folder, ie C:\BF2_ModTools\data_ABC\Worlds\ABC\world1\ODF.
If they don't show up I'd guess that you forgot to copy the related meshes and textures into your MSH folder.

Yes make sure you get ALL of the required assets for that object : msh,odf, option files and texture files

Thankyou, I added the msh files but forgotten about the texture.

No problem