HELP with module setup

Hi hope someone can point me to the right direction. 

 I have a module which 

Dimension by Agreement Number (xxx1, xxx2 etc) 

Timescale by month (Jan 19, Feb 19 etc)

Line item :Start date : (when the agreement start) Feb16, Jan 17 Etc

Line item  Income : by the contract for every month

I now need to show that data by:

Timescale by month (Jan 19, Feb 19 etc)

Line item Income , but now group by the start date

As I have alot of contract the modules size is enormous!! Any suggestion please? 

Kind regards