Need Waypoint editor to add waypoint Manual on the scene game then call especial function to attach to object, start follow waypoint. So the waypoint (lines) can be edited to form any shape.
-End of WayPoint
-Loop WayPoint ( If the object finish the line waypoints, restart.)
blaa, blaa etc...
check the RTS behavior it has way points and things like that you can make a fairly complex path movement using it if that is what you are looking for.
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Portugal, I believe what you're requesting here is path behavior, and if that's the case then both madster and linkman are working on thier own behaviors for it. Or at least they were. Or were going to. Something like that.
The thread is here in Feature Requests, just a couple threads down from this one.
If you haven't seen it already, check out ROJOhound's Path Movement