Spawning Multiple Turtles in a python

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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)