Many architects is working with AutoCAD system. But it is very time consuming work when it is needed to do such a work like drawing 3D models of walls with openings. This can be solved because of AutoCAD open architecture. Advantages of this would be less of errors in drawings and more time for other work for architects. Created software is able from 2D draft of lines make 3D walls and, if was chossed, openings. The user describes dimensions of wall and / or opening and the program will change selected line by set of planes with the opening inside. There are a few aviable options for user choise: openings may have a form of triangle or rectangular, walls maybe be like surfaces or lines, it is possible to create a wall with an array of rectangular openings, and delete already created walls leaving primary lines. For software creation was choosen Visual Basic for Aplication programing language because of it is object – oriented and easy comunication with standart AutoCAD’s classes and graphical objects. User‘s dialog’s form was choosen nearly these, what apear in such software like Architectural Desktop because of its logical simplicity. Supposing created software will be developed further in these ways: o Adding more opening’s shapes o Creating library of opening’s o Supporting all standarts needed for professional.