If you'd like to move the content of one element into the content of another if fairly easy.  In this example, we're going to move the contents of <provider> <source> to the end of the comments element. 

First, select your target element, say for example it reads like this:

  <provider>    <name part="full">TrueCar/TrueCar</name>
    <service>New TrueCar/TrueCar Auto Buying Customer Inquiry</service>
  </provider>
</prospect>


You would copy "<service>New TrueCar/TrueCar Auto Buying Customer Inquiry</service>" and do the following :

IF, <service>New TrueCar/TrueCar Auto Buying Customer Inquiry</service>, Move To, Customer, <comment></comment> .

Then, click "Save Rules" and you should get a popup success message.

See below for visual example: