We have always heard Content Writers complaining when they get tasks like Adding and Updating Items in bulk about 200 ~ 300 Items and more. For such scenarios there are multiple ways to complete the task, but there isn't a single way where we can achieve it within Sitecore and in minimum clicks. BULK Item Editor is the tool Content Editors/Writers would Love to use, as this tool will help them to Create, Update and Many more Bulk operations which will be released in future versions.
These instructions will get you started playing and applying bulk item operations like creation and updation.
A step by step series of examples that tell you have to get a development env running