We are using SharePoint 2007.

We got a request from the user to create a new site under , lets say, http://sp.company.com/sellside
and there is nothing under URL above
The error message: http 404 The webpage cannot be found. no_top_url.jpg is attached.

At the same time, there are other sites, that have that URL ( http://sp.company.com/sellside) part of their address. For example:
http://sp.company.com/sellside/research
http://sp.company.com/sellside/sales

no_top_url_subsite.jpg is attached

How to create the additional site under http://sp.acml.com/sellside?
Is this something you can give us advice at?

Thank you in advance
-Marina