From FreeCAD Documentation
- DataBase: Reference to base object (the one to make the cutout in). The object should be a single solid.
- DataTool: Reference to tool object (the object that is to fit into the cutout). The object can be a single solid, or a valid compound of solids.
- DataMode: The mode of operation, equals 'Cutout' (Changing that will transform the tool into another Part_JoinXXX). The value of 'bypass' can be used to temporarily disable the long computations (a compound of Base and Tool will be created, which is a fast operation).
- DataRefine: Sets whether to apply Refine operation or not, to the final shape. The default value is determined by a 'Automatically refine shape after boolean operation' checkbox in PartDesign preferences. When Mode property is 'bypass', Refine is ignored (never applied).