I've been atempting to make a Multi-player map For our new clan (yet to be named) But i've been having problems puting vehicles on the map "Without" Anybody inside them??
Not having all the details of your problem, I'll take a guess at the issue.
Probably what's going on is that you have not defined one of the playable units to be the player. That is, you have selected either "playable" or "not playable" for each unit, while not making one of them "player".
If you do not have a unit marked as "player", then the editor does not allow you to place empty objects (which includes vehicles). Thus, change any one of the playable units to "player", then your problem will be solved.
Player simply denotes which unit the player will be in a single player game, but it does not restrict your unit choice in multiplayer. In multiplayer, the player unit acts just like any other playable unit in that you have the option of choosing it, but are not forced to choose it.