Helpo de LibreOffice 24.8
Locate that 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.
Adds the selected library as a read-only file. The library is reloaded each time you start LibreOffice.
Replaces a library that has the same name with the current library.