How do you make a new website at plesk at httpdocs

This is what my boss wants me to do in our plesk enviroment:

Website being at document root(i think?):

This site is in the smth else folder of the httpdocs of another site:

On file manager it looks like this:

I have searched so deep in the documentation and nothing helps. Tech of company who works away from here tells me I am supposed to know this but there is no info online on the subject.

Only thing I have found is that this is supposed to be done by creating new subscriptions but the company senior dev says it's not. (my source on that)

When creating a domain I can only use other already created sites on the location of website files field and I cant clear that field:

So, How do you make a new website at Plesk at httpdocs?

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