Now an author has assign a category tag to post one by one, even if those posts are going to be in the same category.

Once a tag needs to be modified or added, the author has to go through the whole process again. 

It would be quite helpful to be able to assign a category tag to posts in bulk.

For example, it might be a post list for authors to organize posts with category tags.

When blog editing could be more efficient, not only editors but also blog readers would benefit from this feature.