Selecting holes by Diameters, Surfaces, and Parameters implies specifying a rule for hole selection. For example, if you specify a diameter value, the system will search the model for the holes of this diameter and include them in the Hole Group. If you select a surface, the system will include all holes on this surface. If you specify a combination of rules, the system will look for holes that satisfy all of them; that is, if you specify a diameter value and select a surface, the system will include only the holes of the specified diameter that are located on the selected surface.

The Axes method lets you explicitly select and unselect hole axes, regardless of other rules used in Hole selection.