We had a development agency set up an instance of the CMS with the view that it would be a multisite CMS. They have not provided any documentation or training and will not do so unless we pay additional costs. We have one website live and we would like to spin up another site within the CMS.

Our current website has the url as follows (where xxx is a client id):

https://xxxxxxx.dxcloud.episerver.net/

• I have gone to the Admin > Config > System Configuration > Manage Websites
• I have created a new website and inserted a name using the same URL with a "/name/" at the end but I get an error message saying the address is already used
• I have created a new website using extension "/name/" on its own but then I get an error message saying that it is not a valid URL
• I have create a new website using a different URL (external), and then selected a starting page. However, when I go into the site I am redirected to the external URL and not the page I want to edit. 

I have searched the episever/optimizely user guide and it doesn't cover this in the manage website section.

My questions are as follows:

1. Is there a way to create a new website using the same or other internal address until an external domain name is pointed to site?
2. If using an external URL, I presume that it needs to be pointed to the episerver instance. If so, could someone direct me to what I need to do to arrange this.

Thank you in advance