====pec_group({{ArgTypeString}} label)====
''Example:pec_group("Subtract_Object","Rect_Strip1","Rect_Strip2PEC_1")''
Description: Creates a Boolean object named 'label' by subtracting object_2 from object_1. An error will be thrown if a Boolean object named 'label' already existsPEC material group in the current module.
====union({{ArgTypeString}} label, {{ArgTypeString}} object_1, {{ArgTypeString}} object_2)====