Each motor will have discrete IO tags: motor1_start, motor1_stop, motor2_start, motor2_stop,.... and so on. Create two indirect discrete tags, motor_start, motor_stop. Typically you'll have a graphic of your motors that has an action link that runs a script when you click on it:
motor_start.name = motor1_start.name;
motor_stop.name = motor1_stop.name:
etc
When you install Intouch you have the option to install the documentation. It will appear as Books when you navigate to Wonderware from Start/Programs button. Their documentation is second to none and gives a detailed answer to your question.