This is an example of how to extend the demo.vmd to include Lab data, including a ZLR segment for use with legacy lab data.
Note: You will probably need to modify this VMD to match your exact requirements.

How to use the demo_lab_zlr.vmd:

• Add the demo_lab_zlr.vmd to your project
  Note: You can also copy it into <iguana install dir>\edit\admin\other
• Use the VMD with hl7.parse{} and hl7.message{}, etc.

See these two tutorials that demonstrate how build this from the demo.vmd: Chameleon: Creating a Lab Message VMD and Chameleon: Add a Z segment to a Lab Message VMD.
Note: You can adapt this process to add your own requirements.