I think you can use a pivot table chart for a table like you attached. First dimension Quarter, second Month.
Then you could use three expression that aggregate your values. I personally wouldn't repeat mn, bn (for million, billion ?) at each line, but just state it at the expression header label.
Not sure if this all is really helpful for you, but without knowing your data (model) and your aggregation needed, I don't know what more to say.
Pivot tables are one of the chart sheet objects types.
All depends on what you want to achieve, what your requirements are. What are the fields you need to aggregate?
I see that your calendar is only linked by year to Rate table (you only have a year field in Rate table), so I assume it's getting hard to group / evaluate your data per Quarter and Month.
If you want to share some data, that might help, but more important is that you need to know what you want to do with your data.
