Use multiple selectors to dynamically join tables to create calculation with DAX and Power BI

Hi JFG1234 ,

I created a sample pbix file(see the attachment), please check if that is what you want.

1. Create two round dimension tables 

2. Create two separated slicers and apply the round field of the above dimension tables

3. Create the measures as below to get the result for the different round selectors

Result Round A = 
VAR _selr1 =
    SELECTEDVALUE ( 'Round A'[Round] )
RETURN
    CALCULATE (
        SUM ( 'Table'[Result] ),
        FILTER ( 'Table', 'Table'[Round] = _selr1 )
    )

Result Round B = 
VAR _selr1 =
    SELECTEDVALUE ( 'Round B'[Round] )
RETURN
    CALCULATE (
        SUM ( 'Table'[Result] ),
        FILTER ( 'Table', 'Table'[Round] = _selr1 )
    )

4. Create a dimension table as below using "Enter data" method

5. Create the measures as below to get the count of IDs for different status

Measure = 
VAR _selstatus =
    SELECTEDVALUE ( 'Status'[Status] )
VAR _selr1 =
    SELECTEDVALUE ( 'Round A'[Round] )
VAR _selr2 =
    SELECTEDVALUE ( 'Round B'[Round] )
VAR _tab =
    SUMMARIZE (
        FILTER ( 'Table', 'Table'[Round] IN { _selr1, _selr2 } ),
        'Table'[ID],
        "@r1", [Result Round A],
        "@r2", [Result Round B]
    )
RETURN
    SWITCH (
        _selstatus,
        "Added", COUNTX ( FILTER ( _tab, ISBLANK ( [@r1] ) && NOT ( ISBLANK ( [@r2] ) ) ), [ID] ),
        "Removed", COUNTX ( FILTER ( _tab, ISBLANK ( [@r2] ) && NOT ( ISBLANK ( [@r1] ) ) ), [ID] ),
        "Negative",
            COUNTX (
                FILTER (
                    _tab,
                    NOT ( ISBLANK ( [@r1] ) )
                        && NOT ( ISBLANK ( [@r2] ) )
                            && [@r2] - [@r1] < 0
                ),
                [ID]
            ),
        "No Change",
            COUNTX (
                FILTER (
                    _tab,
                    NOT ( ISBLANK ( [@r1] ) )
                        && NOT ( ISBLANK ( [@r2] ) )
                            && [@r2] - [@r1] = 0
                ),
                [ID]
            ),
        "Positive",
            COUNTX (
                FILTER (
                    _tab,
                    NOT ( ISBLANK ( [@r1] ) )
                        && NOT ( ISBLANK ( [@r2] ) )
                            && [@r2] - [@r1] > 0
                ),
                [ID]
            )
    ) + 0

Measure 2 = SUMX ( VALUES ( 'Status'[Status] ), [Measure] )

6. Create a matrix visual as below screenshot

Best Regards