Lets say i would like to combine the Tri LED and the Accelerometer and there is a Default in source for Tri Led , I must put in it in the and start another New Void() paragraph?
There is a lot in that question that I do not understand. But, no, you do not start a new function to deal with the LED. There can be only one setup() and one loop() function.
Within the setup() function, you can have code to set up more than one sensor. Within the loop() function, you can read more than one sensor's output, and control more than one output device.
Care needs to be taken that you do not block in the loop method, waiting for a button press, for instance, ignoring all the other sensors outputting data.