Location to Place Archive Files with Existing Site?

We have a WP site (shirts.com) as the only domain in our cPanel and love the themes, layout/look, etc and want to create a second site (swag.com) with different content, but the same themes & layout/look as shirts.com, to sell completely different (non-shirt) items.

Where should we place the copied shirts.com files? Since shirts.com is already in the public_html folder, if we use duplicator to copy shirts.com, where should we place the archive & install files that duplicator creates to be able to have both sites live? Should we create & place the install & archive files into a sub-folder ie: public_html>swag? Will both sites resolve correctly? Will we need to move shirts.com into a new sub-folder in public_html?