How do I do multiple closings for an angel round?

The following is from Ask The VC, where Brad Feld and Jason Mendelson of Foundry Group answer questions related to venture capital investment and startups:

Q: How do I do multiple closings on a single round work? In our case, we have an investor wishing to give us headstart, certainly I imagine not an uncommon case in friend and family scenarios, though here we’d have multiple rounds of angels, without kicking up the gears to flush out a full seed round with other investors before that money changes hands.

Full Answer: http://www.thedeal.com/techconfidential/vc-ratings/ask-the-vc/how-do-i-do-multiple-closings.php