I want to make several objects travel on the same path but at different times and speeds…
but i don’t want to keep creating the same path for each object.
how do i do that?

Flash 5 can do this, I’m not sure about 4. Try placing more than one layer under the guide layer. It may be that they will each follow the same guide that way. Also, the guide itself is just a line, if you select it, then copy it, you can choose to “paste in place” on multiple guide layers.