The part is likely currently only added to the page. In order to have the part show across multiple pages at once, it will need to be added to the template. When a part is added to the Template, it will show on all pages associated with the template.
  1. While logged into NetCommunity, navigate to the page which has the part on it currently
  2. Click Edit the page
  3. Click the gear icon of the part in question
  4. Click Cut
  5. Click Template Designer
  6. After the template loads, click within the content pane where you want the part to show
  7. Click Paste