You can access the Saras Manager from the use the main window's advanced menu or the button which appears when you select a sara in the properties inspector or, once in the saras editor, using the ellipsis button at the top left near the currently-displayed SaraSet name.
from the property inspector
from the saras editor
The SaraSets Manager displays the list of available SaraSets on the left and the Saras contained in the currently-selected SaraSet on the right.
Below the list of SaraSets are buttons which can be used to add, delete, rename or duplicate, the currently-selected SaraSet.
At the bottom of the dialog, depending on the context (standalone, scriptline sara or global sara), a varying set of dialog buttons is displayed, usually to either select or open the currently-selected SaraSet.