So, in the main video I have done 3 times "in" point and "out" point in order to create the 3 subclips.
But I don't understand why in the main video (source panel) I don't see all these "in" points and "out" points corresponding to the 3 subclips ? How to have these in/out points appear in the main video ?
Why doesn't the Source monitor show all three subclips out of the main? Because the metadata for those subclips is stored as data for the subclip not the original full clip. Every item shown as an individual item in a bin has its own meta storage. The original clip has its data. Each subclip has its own, separate data.
I understand what you'd like to see, but the way PrPro stores meta, it ain't gonna happen.