Locate the LibreOffice Basic library that you want to add to the current list, and then click Open.
Enter a name or the path to the library that you want to append. You can also select a library from the list.
Insert as reference (read-only)
Adds the selected library as a read-only file. The library is reloaded each time you start LibreOffice.
Replace existing libraries
Replaces a library that has the same name with the current library.