Hello there; Until the video is created, the following data will help. 1- First of all, the roof command in the object tab will help you make quick modeling by creating a base. Therefore, first enter the Object - roof command and determine your contour boundaries on the plan. The command works like a route command, set the limits using grid. 2- You can make any arrangement you want on the roof command in 3d. 3- Enter the steel beam command. While pressing ctrl on the keyboard, the nodal points of the roof object can be captured, in this way, cross the lines of the main geometry with the steel beam command. 4- To create rafter details, you can use the clone or duplicate object commands by selecting the main line beams you created first. 5- You can use the welded joint for the roof. According to the combination logic, first select the main beam, then right click, select the auxiliary beams and finish with the right button. If all of your elements joining at a point are in different directions (if the auxiliary element logic is not available), select all the elements at the welded joint to be connected, and double right-click. The joint will be formed in the dovetail geometry. 6- If you want to connect a steel column and a reinforced concrete wall, column or beam, you can use any column foot combination. Good work.