[libreoffice-users] How to create a new _predefined_ Impress layout

I'm asking my question again.  Hopefully I have included sufficient information that my query is 
easier to understand this time

What I am looking for is how to create a new _predefined_ Impress layout.  

Note: I am _not_ asking about templates.  They are a different matter.  I already use templates.

Explanation:
If you open a new blank presentation in Impress, on the right side is a sidebar entitled "Tasks".  
This then has 5 menus:

Master Pages
Layouts
Table Design
Custom Animation
Slide Transition

The second item, "Layouts" has 12 predefined layouts which one can select.

I would like to create some _different_ layouts which I want to use many times.  Therefore, I would 
like to add these new layouts, which I wish to create, to the 12 existing predefined layouts. 

This will allow me to select them with a single click, rather than manually define them every time 
I want to use them.

I see the layouts are somehow included in the master pages.  All I want to do is add some more of 
my own design.

Thanks,
Ya'akov
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