This plugin aggregates multiple blog(s) into one single blog. The imported blogs must be in the same WPMU installation as the destination blog. Suitable for WordPress MU only.
How to
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Using your favorite text editor, create a .txt file with all the links of the blog you wish to import. Separate each blog in new line. You can name it anything you want. Here’s an example.
https://wordpress.org/blog1/ https://wordpress.org/blog2/ https://wordpress.org/blog3/
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From the menu you can choose to specify categories and tags filter. You can have multiple filter in one line. They are comma seperated.
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Click on import button and begin the import.