To Copy a Custom Content Library From One Machine to Another (AutoCAD Mechanical Toolset)

Click Content tabLibrary panelContent Manager. Find
In the Content Manager dialog box, in the Content panel, click .
In the Content Manager - File Locations dialog box, in the Custom Content list, locate the library you want to copy.
In the Library File column, note down the path to the folder containing the .GDB file that is listed in that row.
Copy the folder to the clipboard.
Launch File Explorer and navigate to the destination machine and paste the folder in the desired location.