GROUP table to boolean

See the working here - Open a blank query - Home - Advanced Editor - Remove everything from there and paste the below code to test (later on when you use the query on your dataset, you will have to change the source appropriately. If you have columns other than these, then delete Changed type step and do a Changed type for complete table from UI again)

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjU1VdJRcnRy1jUwBDGUYnVggk4ujhBBJ6igGUylEZJKc5igMZKgBUw7SKWzUmwsAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Order Nr" = _t, Customer = _t, Key = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Order Nr", Int64.Type}, {"Customer", type text}, {"Key", type text}}),
    CustomerList = List.Buffer(List.Zip({#"Changed Type"[Order Nr],List.Transform(#"Changed Type"[Customer],each Text.Start(_,3))})),
    KeyList = List.Buffer(List.Zip({#"Changed Type"[Order Nr],List.Transform(#"Changed Type"[Customer],each Text.Start(_,3)), #"Changed Type"[Key]})),
    #"Removed Columns" = Table.RemoveColumns(#"Changed Type",{"Customer", "Key"}),
    #"Removed Duplicates" = Table.Distinct(#"Removed Columns"),
    #"Added Custom" = Table.AddColumn(#"Removed Duplicates", "ABC", each List.Contains(CustomerList,{[Order Nr]}&{"ABC"})),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "BDA", each List.Contains(CustomerList,{[Order Nr]}&{"BDA"})),
    #"Added Custom2" = Table.AddColumn(#"Added Custom1", "ABC Key#(tab)", each List.ContainsAny(KeyList,{{[Order Nr]}&{"ABC"}&{"B"},{[Order Nr]}&{"ABC"}&{"C"}})),
    #"Added Custom3" = Table.AddColumn(#"Added Custom2", "BDA Key", each List.ContainsAny(KeyList,{{[Order Nr]}&{"BDA"}&{"B"},{[Order Nr]}&{"BDA"}&{"C"}}))
in
    #"Added Custom3"