create new groups from existing table

Hello adavid999 

you can try to add a new column with the new region name

Group by this column, applying exactly the measures you want and after that combining both tables. Here the code for a short example

let
	Source = #table
	(
		{"Region","%","resp"},
		{
			{"x","5","2"},	{"y","10","3"},	{"y","15","4"}
		}
	),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"%", type number}, {"resp", type number}}),
    #"Added Custom" = Table.AddColumn(Table.RemoveColumns(#"Changed Type", "Region"), "Region", each "group xyy"),
    #"Grouped Rows" = Table.Group(#"Added Custom", {"Region"}, {{"%", each List.Average([#"%"]), type number}, {"resp", each List.Sum([resp]), type number}}),
	Combine = Table.Combine({#"Changed Type", #"Grouped Rows"})
in
    Combine

Copy paste this code to the advanced editor in a new blank query to see how the solution works.

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Have fun

Jimmy