This is a general doubt posted by beginners in civil engineering and who are starting to model or scheme building structures in ETABS or StaadPro.
The kind of doubts civil engineering job aspirants have range from splitting a beam in model to deciding which is the main beam. Many believe that a column is needed at all beam ends.
I had a similar question from a student about Primary and Secondary beam.I have elaborated this in a blog here so that it is clear to all readers.There is also a video in the blog that explains it in detail. I suggest you read the blog in full and then see the video for additional points.
You can use this Forum space for discussing any doubts that you have on this particular topic. If you have any other structural design related question,then either start a new discussion thread in the forum or contact us here