To perform manual labelling (or to correct automatic labellings) in sulci graphs, you can copy and paste label values between graph nodes (inside the same graph or between different graphs). The attribute used to pick / store label values depends on the the label_property (name or label) of the global attributes for each graph, just like nomenclature colors application. Note that if your graph does not have the label_property attribute, then the default value is the value of graph parameters => Use attribute => label or name.
For instance, to copy/paste bewteen different graphs:
Load 2 sulci graphs.
Change or check the value of label_property by clicking on Graph => Labelling => Use Automatic Labelling.
Place each graph into a
.Select a node from graph A (make sure the window is in selection control mode).
Click on space key (to store the attribute value). The label value and color should appear in a small box in the top toolbar of the window.
Select a node from graph B.
Click on <ctrl> and <enter> keys (to copy the attribute value).
Don't forget to save the graph and provide a new name if you don't want to erase the original file.