I'm sorry for not answering your question, but it sounds like you are trying to build coasters around the paths? So you're trying to build a path to the entrance/exit to the coaster before actually placing the coaster itself? Why not buy the coaster and put it in the place you want it, then start a path (queue or exit path) beginning from the entrance or exit?

So instead of designing your coaster around your path, build your path around the coaster! Again, sorry for not answering your actual question and immediately offering an alternative, but this is how I do it when I play.

Some of your terminology and phrasing is a little odd. It might help if you post some screenshots to demonstrate the issue you're running in to.

I think what you're getting at is that you're plopping down pre-builts, likely some of the junior coaster or wild mouse coaster designs which have lots of track immediately around the station, and then struggling to get the entrance and exit to connect to your midway (the rest of the path in the park). If this seems complex or confusing you may be misunderstanding foundational aspects of how the game works, so seeing an example would really help us hone in on the disconnect.

First I will say, these prebuilts generally have a scenery toggle (though it won't work unless you have all of the pieces available in your map). This includes path! Most of these prebuilts will already have path saved with the design which brings out easy attach points for you to use. Second, you can rotate these designs to make the distance from entrance/exit hut to midway as short and direct as possible. From some of your posts it seems like you might not be aware of this.

You're using OpenRCT2, right?