Hello ! 
Here’s my new problem …
I made a few curves and objects added to them. When I push play each object travels on its curve, as it should.
Now is the fun part
Objects form a single group. Emitter created and added to the group.
I want to let out by the emitter objects moving on their assigned curves.
Now emitted objects just flow into space -doesn’t “see” the curves.
How to assign emitted objects to curves ?
Have a nice day !
select the curve and then add forcefield curve guide. or you can just use the forcefield curve guide as the path. not sure how that will work with multiple paths though
This doesn’t work as I wish. But thanks !
I will think how this curve guide may help me 
Make an invisible object go on the path you need your particles, then change the particle mode into Boids.
first, I have become familiar with the boids -it’s nowelty for me.
For now topic is closed.
Tnak you