Hi Tarek, I'm not completely sure what you're asking, so could you specify a bit more what you're after here? But, if you're a new Tekla BIMsight user and thinking about the best way to start the learning process I'd suggest you to begin with the 9-minute instruction video found on this page http://www.teklabimsight.com/getStarted.jsp The video shows you how to combine models, check for clashes and then communicate about the found issues with your project team. After checking the video I'd suggest you to glance through the feature videos found on the following page http://www.teklabimsight.com/helpcenter/takeATour.jsp to familiarize yourself with the basic Tekla BIMsight functionality And then if you want to get more detailed information about any feature, please take a look at the Help section http://www.teklabimsight.com/helpcenter/help.jsp Thanks, Heikki