Have you look at External Rules?
In your iLogic browser hit the 'External' tab, Right click, create new external rule, copy your code into there.
In your ipt iLogic you can then tell it to RunExternalRule("Your rule name here") that way if you need to make a change to anything in the iLogic you only need to change the one external rule and not all the ipt's - very useful if you rules are used across many parts.
One note of caution, if you are calling parameters in your iLogic rules you will need to call them as
Parameter("your_parameter") rather than your_parameter
