Formula to Amortize Expected Revenue across Months of a project

Hi all,

This is my first post so I am not sure if I am doing this correctly but thank you in advance for any help.

Here is my issue: I have to flat line amortize Estimated Revenue across a number of Months a project is going on. Currently I have a report that leverages IF function to amortize across NETWORK DAYS but the thing is dense and I can figure out the exact breakdown.

(Hypothetical) Data Set Up:
A1 = Estimated Revenue
B1 = Start Date of Project (XX/XX/XX)
C1 = End Date of Project (XX/XX/XX)
D1-O1 = 12 Month Breakout of year

What formula would I use to amortize A1 equally for any month in START DATE --> END DATE?

Thank you.