Parameter table dimensions - summarize

Field parameters aren’t actual columns, so they can’t be used directly inside SUMMARIZE. They act more like a dynamic dimension selector. To work with the selected field, create a conditional measure that responds to the chosen parameter value.

Example:

VAR _order =
    SELECTEDVALUE ( FieldParameter[Order] )

RETURN
SWITCH (
    _order,
    1,
        SUMX (
            SUMMARIZECOLUMNS (
                'Table'[Column1],
                "@value", [The Measure]
            ),
            [@value]
        ),
    2,
        SUMX (
            SUMMARIZECOLUMNS (
                'Table'[Column2],
                "@value", [The Measure]
            ),
            [@value]
        ),
    3,
        SUMX (
            SUMMARIZECOLUMNS (
                'Table'[Column3],
                "@value", [The Measure]
            ),
            [@value]
        )
)