Moving Some Articles to new site

I would try the following:

site #1 == source
site #2 == destination

On the Site #1:

  1. on all the post you want to move/migrate allocate them a category say ‘moved’
  2. export them using ‘Tools’ > ‘Export’ (select ‘Posts’ and specify categories ‘moved’)

On site #2:

  1. Import your exported file using ‘Tools’ > ‘Import’ > ‘WordPress’ and follow the on screen instructions. You might also want to import related media or attachments.
  2. remove ‘moved’ category in the category editor: ‘Pots’ > ‘Categories’

back to site #1: put a redirect on migrated posts

  1. install ‘Redirection’ WordPress plugin
  2. now configure all the redirects for each post or moved category to redirect to your new site/posts.