Originally Posted by Tolkamp
A friend of my has a Calibre library with books.
Is it possible to add (merge) this library to my own Calibre library?
Follow Starson's Advice to Import.
but a Warning: When copying the other Library to your HD. Make it a NEW folder location outside of the existing Calibre Library.
place (or delete) files or folders inside the Calibre Library.
Think of Calibre as a Governmental office.
It has to fill out all the forms, dot all the "i's" before it will store your book.