Issue Shift+Orders?

Can you do this with triggers? Let's say I wanted to order the unit from Point A to Point B then Point C, I could hold down shift and order him to do so ingame but I wanted to know if it can be achieved using triggers.

check resource section for custom rally points system

Ah silly of me, but I was really just asking if I could order shift+orders, but I guess it isn't possible. Thanks to both of you!