By default the Publishing portal limits what site templates you can use to create sub sites. You can
override this setting.
In the site that you want to be the parent site for the Blog
Go to SiteSettings > Page Layouts and Site Template Settings. In the Subsite Templates section of
the page add the Blog (All) template from the left hand list to the Right hand list. Click OK.
You will now be able to create a Blog as a subsite to the current site. These settings can be
configured on each site or you can apply a setting from any upper level site throughout the hierarchy.
