merging websites

Site URL: https://www.supernetwastebasket.com/

I'm not sure how to tag this question. I have built two websites on squarespace. Just for my own businesses. Now I want to merge these under one umbrella website. Do I need to start over or is there some way to migrate existing websites to a new site?

I will build a new site and I would like to have, for example, www.supernetwastebasket.com (one of my existing sites), be a subsection of the new site. is this possible?

So you want an existing website, in its' entirety, to appear within a small section of another website that you have?

If you're able to build a new site that will have the contents of both websites, it would be easier. Although, you could really just set up a link to your other website too. Like two buttons, one enters your umbrella site, and another links to your wastebasket site.