Topic on Help talk:Extension:Translate

As part of phab:T250700 I am thinking of moving the section How_to_become_a_MediaWiki_hacker#Communication_tips_and_guidelines (which is simply not a "MediaWiki only" thing, so it's at the wrong place) to a better place, probably New_Developers/Communication_guidelines. And after that, transclude that page into several pages.

How can I take all and any existing 25 translations for those strings that are part of that section with me?

Stuff like Help:Extension:Translate/Move_translatable_page only explains moving a complete page, but here I'm after splitting.

Any best practices documented somewhere?

Thanks in advance!

I am afraid there is no support/help for this use case currently. Basically you need to move the relevant source language parts to the new page (keeping the existing ID markers if you wish), mark it for translation and then copy over each translation. Last part can probably be automated with pywikibot or similar and a bit of scripting.