Conversion File JS code

Hello,

I have a senario where in I have an ID defined as (ID=0CO_AREA+*STR(_)+ID)

Transformation file for ID

ID=0CO_AREA+*STR(_)+ID

In Conversion file

NODENAME=NODENAME (Since the hierarchy already contains the Controlling area)

Now using Java script I want to split the hierarchy code with "_" between the Controlling area and ID. The ID length is not fixed.

Regards