Is there a way I can add to a forge server 2 sites but without forwarding a domain?

Yes, you can add additional sites to your Forge server without forwarding a domain.

1. First, create a new site in Forge by going to your server dashboard and clicking on "Create Site."
2. In the "Domain" field, enter the IP address of your server followed by a unique identifier for your new site (e.g. 123.45.67.89/mysite).
3. Leave the "Web Directory" field blank to use the default directory for your new site.
4. Choose your desired PHP version and any additional options you need.
5. Click "Create Site" to finish.

Now you can access your new site by visiting the IP address of your server followed by the unique identifier you chose. For example, if your server's IP address is 123.45.67.89 and you chose "mysite" as your unique identifier, you can access your new site by visiting http://123.45.67.89/mysite in your web browser.

Here's an example of what the Forge site creation form might look like:

Domain: 123.45.67.89/mysite
Web Directory: 
PHP Version: 7.4
Options: SSL, Redirect to HTTPS

Note that while this solution allows you to access your new site without a domain, it may not be ideal for production use. It's generally recommended to use a domain name for your site to make it easier to remember and share with others.