Seems to belong in the Kindle forum as its a general question. But wherever it ends up here's a comment on my part
Originally Posted by sorin
Kindle Collection Plugin - i can select multiple books, sort by Author, Collection, Title but i can't add to a collection. Will be great if after i select more books to have an option to move them to a Collection.
As Kiwidude mentioned, you can post in the plugin thread for help on the plugin. If you do, try to provide details on what you are doing and what isn't working for you and it'll be easier to help you. Since the whole point of the plugin is to select and put books into collections, the option to put them into a collection is definitely there