Importing One WordPress Blog into Another WordPress Blog
With this WordPress import script, you can import one WordPress blog into another, and this is true for both the hosted and self-hosted versions of WordPress. WordPress imports all your posts, comments, custom fields, and categories into your blog. You can use the export feature to obtain your blog data.
When you complete the exporting, follow these steps:
Click the WordPress link on the Import page and install the plugin to import from WordPress.
Click the Activate Plugin & Install Importer link, and the Import WordPress page loads with instructions to import your file.
Click the Browse button.
A window opens, listing the files on your computer.
Double-click the export file you saved earlier from your WordPress blog.
Click the Upload File and Import button.
The import script gets to work and when it’s done, it reloads the page with a confirmation message that the process is complete.