Forecast Revenue Data After Invoice Month

tbloom

New Member
Joined
Jun 29, 2015
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Hello, and thank you in advance for your help. I'm attempting to actualize invoice data per month (easy part), and then re-forecast the target revenue for the remaining months (I hate this with a fire of a thousand suns). I'm currently able to forecast for the entire advertising campaign based upon a timeframe and revenue per month, but once I pull in 'actual' invoice data for the month, I can't seem to find an easy way to 're-forecast' for the remaining months based upon a change in a past month.

Line Item (A)Rate (B)Targeting Impressions (C)Target Spend (D)Flight Date Start (E)Flight Date End (F)3/1/2015 (G)March Invoice (H)Revenue Goal Less March (I)4/1/2015 (J)
Animated$51,000,000$10,0003/3/20157/31/2015$1,933.33$2,000$8,000??????

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Currently, I'm able to forecast by month using the following:
Column G
=(IF(AND($F2>=G$1,$E2<=DATE(YEAR(G$1),MONTH(G$1)+1,0)),MIN($F2,DATE(YEAR(G$1),MONTH(G$1)+1,1))-MAX($E2,G$1),0)/($F2-$E2))*$D2

My main question remains then, how do I adequately actualize the March Invoice (H) and give Column J (and any subsequent month) a new revenue goal? How can this stay consistent month to month without changing the formula (so when a new month is added, the projections are instantaneous with the new invoice data?). If you'd like to play around in it, I have a google sheet going:
https://docs.google.com/spreadsheets/d/1kNVzcWHxKFXfK43MxsYgLim3JM3E0SGfr3-zD1tn2CY/edit#gid=0https://docs.google.com/spreadsheets/d/1kNVzcWHxKFXfK43MxsYgLim3JM3E0SGfr3-zD1tn2CY/edit#gid=0
 

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