If u want to call the script from one action to another then 
the below syntax used
 suppose u have created a test1 ,in that you have created 
the all steps for action1.and you have created a 
action2 .now you want to call your script from action 
 
runaction "action1(test1)iteration1"

suppose If you created a Script1 for Reusable  functions 
and say you have another Script2, Script3, etc....
First Open A new Script and click on Insert > call to 
existing action (browse for your script1)and click  
OK.Then,  again click on Insert >Call to Copy of action 
>and  browse for your script2 and click OK........this way 
you can call one script from another......It's a Batch mode.