To link multiple pages to a group:
  1. From your News Feed, click Groups in the left menu and select your group.
  2. Click Settings in the left menu.
  3. Scroll down to Linked Pages and click  to the right.
  4. Click Link next to the pages you'd like to link to your group.
  5. Click Link.
To unlink your Page, click Unlink next to the page you'd like to unlink from your group, then click Unlink to confirm.
Note: Only Page admins can link or unlink multiple Pages to a group.