Filter two tables, code provided but incomplete, requires DAX knowledge

I am having trouble filtering two tables based on eachothers values i.e. date, wholenumber(litra),  etc. see example:

I would like to filter table B using table A as reference in what to filter in B. 

I would like to have the possiblity to choose to filter the table B to show data with dates equal to or above the reference date shown in table A ( so its if table A has: Litra: 2001, Fokus Gruppen: 50% Traktion, Date: 05/09/2019. The table B should show the same filtering except the Date must be equal to or newer than the table A, since it is the data that is dynamic and changing per update.

I have a measure code for the tables, which is abit incomplete and doesnt really filter the date, however it does the job for the Litra and Fokus Gruppen.

If possible I also want to filter on the Fejlkode column, as long as there is value in it, else it must not filter it.

Gentaget = 
VAR temp =
    SELECTCOLUMNS (
        ALLSELECTED ( Fokustog );
        "Dato"; [Litra] & " " & [Fokus gruppen] & " " & [Dato]
    )
VAR currLitra =
    SELECTEDVALUE ( 'TCI2-ER'[Litra] )
VAR currFokus =
    SELECTEDVALUE ( 'TCI2-ER'[Fejlgruppe] )
VAR currdato =
    SELECTEDVALUE ( 'TCI2-ER'[Dato] )   
RETURN
    IF ( currLitra & " " & currFokus  & " " & CALCULATE(currdato;currdato > Fokustog[Dato]) IN temp; "JA"; "NEJ" )

Thank you for your help