Is it possible to assign taxonomy to posts at the same time?

Yes! You can do it in WordPress Bulk Posts Editing Plugin through 2 ways:

Inline Edit/ Bind Edit

1. Select your posts
2. Checked the “Bind Edit” if you want to edit multiple posts at the same time
3. Click on the “Taxonomies” field such as Category, Tags or Custom Taxonomies
4. Select desired terms for each taxonomy

Bulk Edit

1. Select your posts
2. Checked the “Bulk Edit”
3. Select your desired terms for desired fields in the ”Categories/Tags/Taxonomies” tab
4. Click on “Do Bulk Edit”

The above operation is fully stated in the separate article, which you can read if necessary.

Do you still have a problem?

If after reading the articles you still think have unanswered questions or need custom work for your plugin, contact iThemeland Support.