If you use HTMLservice templates, you may want to centralize useful ones and use them in multiple projects, just like you can with library scripts.
All you need to make this work is a library with your template file and a one line function in your library. Here's a snippet from Displaying analytics data on site pages, where I have my template in a library file, as opposed to the project I'm working on.
In my library, I have this function
and an html template called 'instrumentationTemplate'
Back in my main project I call it like this
Job done. Now I can use the same template across multiple templates.
See Google Apps Scripts snippets for more like this
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