Help putting blog posts inside portfolio posts

I have a complicated request, so I need to know if this is possible.

I would like to put an option to be able to put posts in specific categories on portfolio pages (as selected on the portfolio page), in the same style as the "posts" pages.

You can see what I would like by going here:

below the description and above the footer, I would like to place the blog posts like this:

let me know if you think this is reasonable, and if you need any access to be able to help me, I would appreciate it.