It is not clear what you mean by "My code is showing in the document with each record"
There is no Developer's plug in.
If what you are trying to do is a Many to One type mail merge,
download the MergeTools – 20130627 Add-in that I created from the following page of my Windows Live SkyDrive:
https://skydrive.live.com/?cid=5aedcb43615e886b#!/?cid=5AEDCB43615E886B!cid=5AEDCB43615E886B&id=5AEDCB43615E886B%21566
Save the file in the Word Startup folder. In Windows Vista and Windows 7, it is
C:\Users\[User Name]\AppData\Roaming\Microsoft\Word\STARTUP
When you have done that, the tab shown below will be added to the Ribbon:
One thing to note is that the field names in your data source must contain only alphanumeric characters (No @,#,$,%,&,(,), etc) and the field names
must not start with a numeric character (0-9).
You may also want to download
the Using the Many to One Facility document that describes how to use that facility.