Well, now you can create sketches, let use them in Part Design workbench.
1) Basic features
-Creating a pad
Let's tell that your part is opened. Your sketch is called My_Sketch and you want a pad of 20mm height. The code is the following :
'Get the part
Dim My_Part as Part
Set My_Part = CATIA.AcctiveDocument.Part
'Get the part body in the part, assuming your main body is called PartBody
Dim My_Body As Body
Set My_Body = My_Part.Bodies.Item ( "PartBody" )
'Create the pad
Dim My_Pad As Pad
Set My_Pad = My_Part.ShapeFactory.AddNewPad...