Once you have created your library using a tool like Doubley, you can load it into Kontakt through several methods depending on your version:

: It works with any sample format that Kontakt supports, allowing you to compile your favorite sounds into categorized instruments. How to Use Your New Custom Library

This tool streamlines the process of turning raw samples into a professional-looking library:

: Open the Library Browser, click the cogwheel in the bottom left to open the Import Content window, and navigate to your library folder to add it.

You can find more information and purchase the tool from the developer's official page at Doubley Custom Kontakt Library Creator or via OpenSea. How to Add Non-Player Libraries to Kontakt 7 / 8's Browser