How Do You Create Multiple Books at Once?

[AChubbyBlackCat]

A previous conversation has covered this topic before. It may provide some insight to your question.

Juggling Multiple Stories

I am gradually working my way through a story but then out of the blue comes a great idea for a separate story. I really like the idea and want to start writing it but I am in the middle of a separate story. What should I do? Should I postpone the idea and just work on the first one, should I focus all my time on the idea or work on them both at the same time? I am hoping that other writers have had this problem and could explain to me the better choice.