Rolling 12 months and prior rolling 12 months based on date selection

[cerebro]

Dear everybody,
 
i have calculated average discounts and margins by year and product.
I would like to toss years and insert two rolling periods of time to compare with each other:
last 12 months (T-12…T) and the prior 12 months (T-24…T-12)
How do i add a filter where i can pick a date and it would give me the rolling period strating from the picked date?
How can i make sure that measures are calculated on revenues from either acutal or budget but noch both at the same time?

Thank you in advance for your help.

Please see my project file with sample data under the following link
https://1drv.ms/u/s!AhqCxmrXP_AFihq3KZZ78xkT_8hg?e=oB27UC