Zoho Books - Sub total for estimates ? Any way, even non clean or conventional ?

Zoho Books - Sub total for estimates ? Any way, even non clean or conventional ?

Hello, 

I've read a lot of topics about the lack of Sub totals in the Estimates of Zoho Books. 
Sorry for opening a new one, but didn't know if one was more "official".
Has anyone ever found a solution to do this ? Even not very "clean" ?
I guess you can invest a lot of money in developpement.  But it is easier then to move away from Zoho Books. 

Thanks