Creep move trigger!?

[SupraX]

Hey,there ! I'm making new map and i started map editing 2-3 weeks ago and i am good at it.But i have a little difficulty with creep moving.(i don't know how is it called maybe "creep spawn").My map is aos and it has 3 lines it's easy to make the trigger to go forward with Attack-Move but the problem is that the line witch is up and the line witch is down they go forward and then there's a corner then it continues up and i can't make the creeps move first forward and then change the way..If you have ideas please give me in GUI because i am still bad in jass

 

[Archangel_Tidusx]

make a region where you want them to turn. when they hit that region, issue order to attack-move to wherever you want

Unit enters region

Issue (entering unit) to attack move to (region)