The Import feed list feature of the Professional add-on lets you add as many feeds as you want to a campaign in one go, instead of adding them one by one. Follow these four steps.
Go to WPeMatico β Settings β Professional, turn on Enable “Author per feed” feature and Enable “Import feed list” feature, and save the settings. Import feed list needs Author per feed, so turn on both.

Edit the campaign and click the Import feed list button in the Feeds for this Campaign box. A text field appears in place of the list of feeds.
Paste the addresses of the feeds, one per line. Optionally, add a comma and a WordPress username to set the author of that feed.

Click Update (or Publish in a new campaign). The new feeds are added after the feeds the campaign already had.

Note: To learn more about the format of the list and the authors, see How does Import Feed List work?