campaign editor

this is probably a really stupid question but how does the campaign editor's object editor (or whatever) link to each map's object editor (when the map has been created). How can i get these centralised units/spells to each map from capaign editor. Also when i save camapign it says the campaign "contains map files which are not used" all of them) what does that mean? and all the maps were started before I made the camapign file.

If you change anything in the Campaign's Object editor, those changes overrule any others. The second part means you have maps or files imported that aren't used...

k thx i think i need to reopen the we to make those changes work.