Calling AR sub template .rtf for AR Invoice Print

Summary

Calling sub template .rtf from main .rtf template for AR Invoice Print

Content

Go Live Goal:  I'd like to call two sub template .rtf's from a Main.rtf for the AR Print Invoice Template based upon the transaction type although I cannot seem to get the subtemplates to be displayed. 

Testing Goal: For my understanding of how I think this should work I'm trying to call a very basic sub template .rtf that says "Hello Template1" from a Main.rtf template so that I can view the subtemplate from AR Manage Transactions.  Every time I've done this and click on the View Image from the Manage Transactions it says "No Image" for my Go Live or Testing Goal.  I will upload a word document of the steps I am taking for my Testing Goal.