power query/ dax measure , multiple conditions/ multiple answers

You may use measure like

Shared :=
VAR TotalRevenue =
    SUMMARIZE (
        Revenue,
        Revenue[category],
        "Revenue", SUM ( Revenue[revenue] )
    )
VAR AddShares =
    ADDCOLUMNS (
        CROSSJOIN (
            TotalRevenue,
            Shares
        ),
        "ToTake",
            Revenue[category] = Shares[employee]
    )
VAR Filtered =
    FILTER (
        AddShares,
        [ToTake]
    )
VAR KeepColumns =
    SELECTCOLUMNS (
        Filtered,
        "Employee", [employee],
        "Manager", [accountmanager],
        "Revenue", [revenue],
        "Share, %", [share accountmanager]
    )
VAR Result =
    ADDCOLUMNS (
        KeepColumns,
        "Shared",
            [Revenue] * [Share, %]
    )
RETURN
    SUMX (
        Result,
        [Shared]
    )

For Power Query only no changes are required