How to use TMVL(%Variable1%,%Variable2%) ?

Hi Gurus,

My requirement is showing cash collections on a report. There are many different maturity dates thats why I want to use it as a variable.
For instance, I have calculated cash amount as 200$ for June and matuirty is 40 days which means the money will be collected Agust. one of the report i have to show it.

So far I have tried to use TMVL like (  %Variable1%:number of months,  %Variable2%:TIME(no problem for this variable)  ) but  it didint work. do you have any ideas? If not TMVL how can i do this?

Thanks in advance,
Regards,