Yes, you can if you feel it's necessary and appropriate. There may be times when sharing the entire story is the best way to convey all the details, emotions, and context.
Yes, of course you can. If it's your story to tell, go ahead. Just make sure the time and place are appropriate, and the audience is willing to listen.
Consider your time limit first. If you can fit the whole story within the allotted time and it adds value to your speech, then you can tell it. For example, if it's a motivational speech and your whole story can inspire the audience, it's okay.
It depends on the nature of the story. If it's a success story of a similar project that can serve as an example or inspiration for the current business matter, then you may be able to briefly tell the relevant parts of the story. But if it's a long - winded personal story, it's not appropriate for a business meeting. Business meetings are for discussing strategies, progress, and making decisions, not for storytelling in general.
Yes, you may. It's important for the court to hear the complete account so that a just decision can be made. Please start from the beginning and be as detailed as possible.
It could be that you have some constraints like time or you're afraid of revealing too much. Maybe you also haven't sorted out all the details in your mind yet.