Navin,
I agree with your comment about a Design Table being used to create a family of parts - that is, I believe, the primary purpose.
But, a Design Table can indeed be used to create the x, y and z coordinates of a point - the coordinates are parametric values just like any other geometric parameters.
There is a macro in CATIA, Elements From Excel, that will create points based on a spreadsheet. The Design Table method is just another way to do it.