Hi,
that's easy, just use the bullet behavior, depending on what you want to do.
Plenty of examples on my youtube channel:
youtube.com/channel/UCZ6QjvqEs9dR2miRnfFqIpQ
(cross roads game for example lets cars drive from left to right on a constant speed)
If you're new to C3, there's a lot of content to get you going beyond the standard templates and documentation of scirra
Enjoy!