In this video you will learn to place both steel and timber beams by selecting the structural section from the library and placing it in the model spanning between the columns already placed.
If you would like to work hands on with the videos please visit the Bentley Learn Server and download the dataset from the course 'Learning OpenBuildings Designer - Modeling and BIM Essentials'.
https://learn.bentley.com/app/Public/ViewLearningPathWithMasterCourseExpanded?lpId=116818&mcId=103962