Filtering by dates in two columns

Anonymous i think i understand what you need, but for this you will have to use a Calendar table.

And you will have to create a copy of your data table, like the model in example:

You have a Calendar Table and then Calendar A and Calendar B that are reference Calendar, you have go to modeling and click New Table and the you create:

Calendar A = 'Calendar' 

Calendar B = 'Calendar' 

Table (A) = 'Table (B)'

Table (A) is your actual data table.

On Table (A) create the measure:

Cost A = CALCULATE(
    SUM('Table (A)'[Cost]),
    KEEPFILTERS('Calendar A'[Date]),
    ALL('Calendar'[Month])
    )

On Table (B) create the measure:

Cost B = CALCULATE(
    SUM('Table (B)'[Cost]),
    KEEPFILTERS('Calendar B'),
    ALL('Calendar'[Month])
)

Then you can recreate the connections to model as shown above.

You will be able to achieve what you want:

Regards,

Sérgio Silva