Customer Function Table.Combine

Hi Mic1979 

Try with this 

(
Input_Table as table,
ColumnToRemove1 as text,
ColumnToRemove2 as text,
ColumnToRemove3 as text,

InputColumn1 as text,
InputColumn2 as text,
InputColumn3 as text,
InputColumn4 as text
) =>

let
    // Replace null values with empty strings
    SourceNoNull = Table.ReplaceValue(
        Input_Table,
        null,
        "",
        Replacer.ReplaceValue,
        Table.ColumnNames(Input_Table)
    ),

    // Remove specified columns
    RemovedColumn = Table.RemoveColumns(
        SourceNoNull,
        {ColumnToRemove1, ColumnToRemove2, ColumnToRemove3}
    ),

    // Combine values from InputColumn1 and InputColumn2 into a new column "Helper_1"
    Helper_1 = Table.AddColumn(RemovedColumn, "Helper_1", each Text.Combine({Record.Field(_, InputColumn1), Record.Field(_, InputColumn2)}, ""), type text)

in
    Helper_1