I'm afraid that you're not being specific enough with your request for help.
So I'll tell you a little story.
I remember back to my second day of using ArchiCAD, September 1991, and I had to put some roofs on a house. After being shown how the roof tool worked and marveling at it I set about springing my roofs here there and everywhere they were supposed to be. I did pretty well except that one of them was pitched the wrong way and sloped ito the house. I argued that I did it all correctly and that the software must have been faulty but I was wrong.
Since then the roof tool has become even more useful and a little more complex but when I get it wrong I know it was my fault.
