Phased an income over period

Hi 

 

I need to phased income over time over period (example below)... any suggestion how I can do that please?

 

Income per month line is where I want to get to!!

 

Thanks in advance

 

Income100200150    
        
 JanFebMarAprMayJunJul
1204030    
2 204030   
3  204030  
4   204030 
5    204030
Income per month20609090907030
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