How do I create a measure that returns two different values based on condition

Hi simuruge 

I create a simple sample. Please try the formulas to check if it is what you want.

• For this formula, if we don't select any values in slicer, it will return 0 by default.

Measure =
VAR Selected_Version =
    SELECTEDVALUE ( 'Table 1'[Version] )
VAR a =
    SUMX (
        'Table',
        'Table'[Plan]
            + IF ( 'Table'[Version] = Selected_Version, SUM ( 'Table'[Perf] ), 0 )
    )
RETURN
    a

• If you want to show other data without selecting, you could try this:

Measure 2 =
VAR Selected_Version =
    SELECTEDVALUE ( 'Table 1'[Version] )
VAR a =
    SUMX (
        'Table',
        'Table'[Plan]
            + IF ( 'Table'[Version] = Selected_Version, SUM ( 'Table'[Perf] ), 0 )
    )
RETURN
    IF ( ISFILTERED ( 'Table 1'[Version] ), a, "No Filter" )

For more details, please download my sample to have a try.