Can "child theme technology" also be applied to templates? PS 8.1.3

[MarkusGER]

Hello everyone,

I want to customize my invoice form (i.e. the files "/pdf/invoice.xyz.tpl" etc.) and I wonder if the mechanism Prestashop offers for theming (creating a child theme which only contains the changes compared to the regular theme) is also applicable to these template files.

In other words, whether you actually have to change the regular tpl files or whether you can override these files with a "copy".

At this point, I would also like to ask whether there is any information on the general concepts used by Prestashop. This is my first online store ever and if you don't know roughly how-what-where is connected and how something is conceptually thought of by the developers, then it will be difficult to work out solutions for certain things, even if you are not completely unfamiliar with PHP, CSS and HTML.

Thank you very much for any hints.
Greetings Markus