Using GirC, it is first necessary to create a new datafile (known in GirC as a dictionary).
Click the button, and fill in the dialog box (see below). Use the name GalenAuthoringTerminology when you plan to use OpenGALEN as the Target Terminology. In case, you want to use SNOMED CT, enter the name SnomedAuthoringTerminology
NB Make sure that you correctly identify which GRAIL Model is to be the Target Terminology for your Authoring Terminology, using the selection box on the right.