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What do you mean you spawned different turtles using ROSSERVICE, did you use something like this?

rosservice call /spawn 2 7 0.2 "another_turtle"

In that case, every time you spawn a new turtle, you will be able to move it independently publishing command velocities under the namespace of the new turtles, in the example above it would be: /another_turtle/cmd_vel

Therefore, you can move it by: rostopic pub /another_turtle/cmd_vel geometry_msgs/Twist "linear: x: 2.0 y: 0.0 z: 0.0 angular: x: 0.0 y: 0.0 z: 0.0"

Then, if you want to move and control all the turtles to different waypoints, you need to write a program which: - Checks where the turtles are. - Compute, for each turtle, a way to get to their goal. - Follow their paths and coordinate their movements if necessary (your planner may be able to do so already)

What do you mean you spawned different turtles using ROSSERVICE, did you use something like this?

rosservice call /spawn 2 7 0.2 "another_turtle"
"another_turtle"

/another_turtle/cmd_vel

rostopic pub /another_turtle/cmd_vel geometry_msgs/Twist "linear:
  x: 2.0
  y: 0.0
  z: 0.0
angular:
  x: 0.0
  y: 0.0
  z: 0.0"
0.0"