getting a section of the body text of one page to populate to others across different domains

i need help in getting a section of the body text of one page (index.html) from one domain's folder to populate to the specific body section of multiple domain's pages (index.html). i know this can be accomplished via css, but every youtube video i search does not address this specific problem, only how to use css as style templates. what i need to happen is every time i update the particular section of the index.html of thedocfactory.com that lists the films and thumbnails or production status of the list of films (over 56 so far) i need to have it update the same list of films on each films individual page. please don't suggest copying and pasting, as i said there are at least 56 other sites that must have that particular section updated each time a new film, preview thumbnail, or status changes, and there are new films added constantly.

all i need is a generic instruction of how the text section of one page can populate multiple pages by linking to it in dw. then i can link all pages once to look at these changes and update their page's section of text.

if you need to see what i'm talking about, just go to http://thedocfactory.com and you will see the list of films. each film listed has its own webpage and usually a "coming soon" followed by a section that lists all the other films in the documentary factory universe. some don't have that section, or much at all as i haven't found a way to make this easy yet, and those that do were populated using copy/paste.

i would also be open to converting the entire documentary factory site to a wordpress that could make this a lot easier if anyone has a suggestion to a wp template that can make life easier for the old man 🙂