How Does That Work Mechanically With a Venture Capitalist?

How does it work with an entreberner talking with a venture capitalist about what that lead investor's allocation is going to be, versus people? Does that happen before the term sheet, after the term sheet? Does it get worked out while definitive docks are getting worked out? Where does that all happen? Definitely before definitive docks, but somewhere between before, during the courting process, and then during and after the term Sheet.