Calculate value difference from column of a same table with hierarchy from another table

Hi everyone,

I have to calculate value difference between rows of the same column in one table where "File Name" column from "Database" table has "File for comparison" file from "DIM_File" table. I've tried with USERELATIONSHIP and it worked, but I was unable to filter the result by "Group".

What I'm trying to get -> Difference=sum(F2[Amount])-sum(A1[Amount])

or visually

Model looks like this

Database table sample:

DIM_File table sample:

DIM_Product table sample:

DIM_Group table sample:

Thanks!