To create a material in the new libraries and catalogs, use command New Material or options , and on the materials toolbar.
To move materials within a library or from one library to another or between catalogs and lists of materials of the current model you can also use "drag&drop". The individual materials can be copied, using the context menu commands Copy and Paste.
If the material or catalog is copied to a material library or catalog that already contains an element with the same name, the copied item will be automatically renamed and numbered with (1), (2) and so on suffix.