OK, I think I undestand how I have to do that:
I have to create specific pages (called pages_portefolio.php and pages_map.php with my examples) with my specific code included in actual Codeblocks and select these custom pages in my portefolio and map pages.

never try, but I will have a look.
my only trouble is to separate "official" php files, managed in github for my themes, and "specific" php files only to suit my needs.
with my solution, I don't have this problem (my own needs are stored in database of my website ;-) )

Yes, that's how I might have done it depending what it is for. If codeblocks work for you go with it. There is no real right or wrong here, just several ways to achieve the same.

You guys are awesome! I am trying to create a family history site with an album page for each family. I'd like to include some family history as pages in the (family) Album page. I like the way the album page has its simplicity and I want users from one family only to see their family's album and history pages. Also I'm thinking of looking to include a family tree which is in html and with an index page, both are maybe best to do via codeblocks. I think codeblocks might work!!

Okay. One tipp that maybe helps you. You can give the album and the page the same name. So if the album name is "familyx" you can give the page the titlelink (=name) "familyx" as well. That way you can easily "connect" pages and albums. It only works that way if albums are top level as sublevel include all levels (on pages this is not the case).