Hi-
I lashed together a sample spreadsheet that may work for you, or should
at least provide something you can build on. Unfortunately I don't
have available time to describe in words the placement of each cell and
formula. Do you have a "blind" or generic email address so I can send
this thing to you? (I'm happy to send it along to whatever address you
specify; I use a blind address for spam avoidance.)

Essentially, the sprdsht tracks each engagement's billing, separately
tracks anticipated receipts by engagement (based on a number of billing
months in arrears that you specify), and separately sums each quarter's
anticipated revenue.

Does that sound like it will be helpful?
Dave O
cyclezen AT yahoo DOT com