Hey there, @DYZ
Bo here from Shopify Support!
That is a great question. It is not possible to host two websites on one subscription. One Shopify subscription entitles you to one website. If you would like to open a second store/site, you will need to start another free 14-day free trial here and then when your trial is over, choose a plan for the new store. These two subscriptions, and stores, would be independent of one another.
As this is your first post in the Shopify Community I would like to welcome you! Welcome! I would recommend reading our guide on getting support from the Shopify Community here so you are best equipped when looking for support through these forum boards.
All the Best,