Knosaj,
It would help you more to learn to model more accurately.All programs take practice to learn.
There are a number of how to videos posted on You Tube such as
this one and
this one. There one on
guidelines can help you use the tools to model accurately.
HTH
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"