How to add portfolio section to home page (7.1 template)?

I'm using https://vandam-demo.squarespace.com/?nochrome=true v7.1 template.I have a Portfolio page (has a few projects), how can I show these in a section on the home page? 

I was able to do this to Blogs as: Home page > Section > Summary > Content > Select a page > Blogs

but does not show the Portfolio page if I try the above.

You need to build your sections on the actual portfolio page with you project selections. You can't bring a portfolio page into a standard page. If that makes sense. So, you'll add all of the sections you want to the portfolio page and then set that portfolio page as your "Home" page.