After an automatic recognition of sulci, it is possible to switch between automatic labelling and manual labelling modes, that is, use the 'name' (manual) or 'label' (automatic) attribute to store labels in graph nodes. You can copy all label values into name values. After that, you can modify the name attributes and keep the original value in the label attribute.
Open a sulci graph.
Click on graph => Labelling => Move automatic labelling ('label') to manual ('name').