Hello there,
Hope you’re doing well. Yes, You can import any posts from another WP website into BetterDocs.
First of all, Go to your WordPress Dashboard -> Tools -> Export. Then, export the Post from this section. Please check: https://d.pr/MsCLbL
Afterward, search this term: post_type. Please check: https://d.pr/i/6uvd1c
Now, replace all the ‘epkb_post_type_1’ with ‘doc_category’ and for tags, replace them with ‘doc_tag’. Please check: https://d.pr/i/rBFgy1
After you have finished doing so, simply just save the file. Before completing the next step, make sure that you have BetterDocs plugin installed. Then go to your WordPress Dashboard -> Tools -> Import and import the .XML file to your WordPress site.
For more details, you can check this doc: https://betterdocs.co/docs/migrate-docs-to-betterdocs/
Hope this information will help you.
Thank you.