Create and use new product page layout

-- url of the page with the problem -- : www.javelincommunications.com/build-you-dream-stanchion
-- HikaShop version -- : 4.7.1
-- Joomla version -- : 3.10.11

One of the keys to customizing Hikashop is the ability to create and use new product page layouts. However, the documentation and the guidance given to me seem to assume that I know how. I don't. Usually in Joomla, we have the ability to copy or save-as. That is missing here. It would appear that we simply rename the trailing tag of our PHP file name and then save. But I don't want to assume anything because it is so easy to break Hikashop and the website with an errant keystroke. Can someone please show me step-by-step how to create a new product page layout and then use it? It seems like a very, very, very useful thing once one learns the trick. And once one gets over not seeing the usual Joomla save-as or copy options.
So, I'm asking:
How to create a custom layout variant by closing an existing one?
Then, how to select it for my product layout?
I think I get but it pays to be absolutely certain. Thank you, my project is really coming along well. It's going to rock.
-Jim Gribble

Again, thank you. In other words, like this?

Then, select it here?


That's very cool. Really fantastic.
Now, we also love Smart Slider 3 for making advanced content blocks with a vast array of amazing effects. Here's a typical insertion code. <?php
echo nextend_smartslider3(834);
?>
Can I just drop that into my new custom layout, at the top say, to create a custom banner?
-Jim Gribble

I think you're referencing Smart Slider?
As far as cloning layouts and selecting them, am I on the right track there?
Thank you!
-Jim Gribble

Nicolas,
I just want to tell you that embedding a Smart Slider banner via PHP layout works beautifully. So we can now have a beautiful, dynamic, completely mobile page banner across the top of our product page.
-Jim Gribble