Associate a new SharePoint site with a Project Server site

​If you have a project that does not have an associated SharePoint site associated with it in Project server:

1. Go to Server Settings

2. Operational Policies > Project Sites

3. Find the site, highlight it, and then click on Create Site, accept the defaults, click OK

If you ever go to create a site for a project and you get an error that the site already exists, follow this support article to repair: http://support.microsoft.com/kb/981853