This is the script used to generate a REQ-RITM the way any user would./ This way you create a cart, add a catalog item,. add values to the variables and submit, it will generate a REQ (that is in the info here) and using that you can find the RITM too
var cartId = GlideGuid.generate(null);
var cart = new Cart(cartId);
//add your requested item to the cart by sys_id of the catalog item
var item = cart.addItem('970949824f69f70099f1b3728110c7d6', 1);
//fill in the variables on the request item form
cart.setVariable(item, "test_box", "testing box"); //parameter 2 is variable name & parameter 3 is value
cart.setVariable(item, "copy_of_test_box", "true");//parameter 2 is variable name & parameter 3 is value
var rc = cart.placeOrder();
gs.info(rc.number); //REQ number
-Anurag
