Here’s what I did after I logged off a while back:
Created a subdomain named https://www.oaspacecoast.org/test and moved all WP files and directories from the ./public_html directory to the new ./public_html/test directory, blank screen.
Redirected the original url to a legacy site.
Installed WP 3.0-beta1 in the new /test directory.
Imported the database using phpmyadmin.
I got the following error: Warning: require(/home1/oaspacec/public_html/test/wp-includes/post.php) [function.require]: failed to open stream: Permission denied in /home1/oaspacec/public_html/test/wp-settings.php on line 368
Checked some of the WP documentation and found the bit about Go to the database of your blog and find the wp_options table. This table stores all the options that you can set in the interface. The WordPress Address and Blog Address are stored as siteurl and home (the option_name field). All you have to do is change the option_value field to the correct URL for the records with option_name=’siteurl‘ or option_name=’home‘. and did that.