New answers tagged export
The WP importer should do the job for you. You may need to install it first. Backup. Backup. Backup. Then, from your current single site: Tools > Export > All Content > Download Then from the new location on your multi-site, Tools > Import > locate the export file and adjust options to your needs. Note - you will need to still take care of settings ...
I was struggling with this as well. Your solution worked, until I found out that it will remove the post format taxonomy for normal post types! After digging around the core files, I found this function which does exactly what we need: register_taxonomy_for_object_type( 'post_format', 'portfolio' ); See Codex.
Manual is sometimes going to get you the best results however, have you looked at this plugin? https://wordpress.org/support/view/plugin-reviews/multisite-clone-duplicator I tend to use WPClone for single sites, if that fails then I use duplicator. Let us know how you get on.
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