Dynamic Expand Power Query Custom Function

Hello,

what I need now is to multiply the column with % in header and column with € in header .

I made the following function:

(
Start_Table,
Table_to_Change,
Start_Table_Col_1 as text, Start_Table_Col_2 as text, Start_Table_Col_3 as text,
Change_Column_1 as text, Change_Column_2 as text, Change_Column_3 as text,
Euro_Value as text) =>

[
Start_Table_Helper = Table.AddColumn (Start_Table, "Start_Table_Helper", each Text.Combine({
Record.Field(_, Start_Table_Col_1),
Record.Field(_, Start_Table_Col_2),
Record.Field(_, Start_Table_Col_3)}, " "), type text),

Clean_Start_Table = Table.RemoveColumns (
Start_Table_Helper,
List.Select(Table.ColumnNames(Start_Table_Helper), each not (Text.Contains(_, "Helper") or Text.Contains(_, "€")))
),

Table_to_Change_Helper = Table.AddColumn (Table_to_Change, "Table_to_Change_Helper", each Text.Combine({
Record.Field(_, Change_Column_1),
Record.Field(_, Change_Column_2),
Record.Field(_, Change_Column_3)}, " "), type text),

Clean_Table_to_Change = Table.RemoveColumns (
Table_to_Change_Helper,
{Change_Column_1, Change_Column_2, Change_Column_3}
),

Changed_Type_Table_to_Change = Table.TransformColumnTypes(
Clean_Table_to_Change,
List.Transform(List.Select(Table.ColumnNames(Clean_Table_to_Change), each Text.Contains(_, "%")), each {_, Percentage.Type})
),

Merge_Start_Table = Table.NestedJoin(
Changed_Type_Table_to_Change,
{"Table_to_Change_Helper"},
Clean_Start_Table,
{"Start_Table_Helper"},
"Value",
JoinKind.Inner
),

Expanded_Merged_Table = Table.ExpandTableColumn (
Merge_Start_Table,
Euro_Value,
List.Select(Table.ColumnNames(Clean_Start_Table), each Text.Contains(_, "€")),
List.Select(Table.ColumnNames(Clean_Start_Table), each Text.Contains(_, "€"))
),

Result = Table.AddColumn (
Expanded_Merged_Table,
"Result",
each (x,y,z) =>
each if Table.ColumnNames(y, each Text.Contains(_, "%"))< 0

then z = Table.ColumnNames(x, each Text.Contains(_, "€"))*(1+Table.ColumnNames(y, each Text.Contains(_, "%")))

else if Table.ColumnNames(y, each Text.Contains(_, "%"))> 0

then z = Table.ColumnNames(x, each Text.Contains(_, "€"))*(1-Table.ColumnNames(y, each Text.Contains(_, "%")))
else "")

]

[Result]

I got the following:

How to get the calculation in the column Result instead of Function?

Thanks.