How to populate a WordPress install with a lot of categories, quickly?

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I would think WP All Import & WP All Export would help here.

  1. You can create 1 category, 1 service etc…. (i.e 1 end point) in the website,
  2. Use WP All Export to export a CSV of the post type in question,
  3. Edit the CSV to include all of the data you need,
  4. Use WP All Import to import the CSV into your post type,
  5. Repeat for each site.