Change a bit your workflow.
It seems to me that what you call a “template” is not the same as the technical templates Writer (and more generally LO) manages. I understand from your description you have a reference document with .odt extension you use as a basis for others. It exists only for the purpose of providing your custom styles.
Writer can manage a dedicated type of document called template with extension .ott. These templates are created from ordinary documents by File
>Templates
>Save as Template
.
You have two ways to use such a template:
-
basic
Double-click on the .ott icon to create a new Untitled.odt document. Note that Writer changes the filename and extension to prevent ersure of the template.
-
integrated into LO
Your template can be made known to LO by File
>Templates
>Manage Templates
and Import button. I recommend you make first a backup copy of the template because LO will move it to one of its internal directories. When you want to modify your template later, you might have same difficulty to retrieve it.
You can register as many templates as you want.
Create a new document with File
>New
>Templates
and select the desired templates.
When you work mainly with a single template, you may find tedious to go through a menu and a dialog to always select the same template. Then, with File
>Templates
>Manage Templates
, make your preferred template the default one. After this, File
>New
>|Text Document
or Ctrl+N is all you have to do to reference your template.
Note: if you’re under Windows, don’t create a new document from the file manager as it will not reference your custom template. Always create documents from inside Writer.