create new Column

shri0025 Try to create a calculated column using this DAX:

Create Column = 
VAR GateEntry = YourTableName[Gate Entry]
VAR FreightAmount = YourTableName[Freight Amount]
VAR GateEntryCount = CALCULATE(COUNTROWS(YourTableName), ALLEXCEPT(YourTableName, YourTableName[Gate Entry]))
RETURN
IF(GateEntryCount = 1, FreightAmount, 0)

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pls try this

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WcnZxNDQwNjSyNFbSUTI0sjA1UIrVISxsARY2MKCbsLGxIQnCJoYQYUPihI1MaCdsYQQJweEtDE0nRiDhWAA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Gate entry" = _t, #"Freight Amount" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Gate entry", type text}, {"Freight Amount", Int64.Type}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Gate entry"}, {{"Count",
 each  Table.AddIndexColumn(_ , "indx",1,1)}}),
    #"Removed Other Columns" = Table.SelectColumns(#"Grouped Rows",{"Count"}),
    #"Expanded Count" = Table.ExpandTableColumn(#"Removed Other Columns", "Count", {"Gate entry", "Freight Amount", "indx"}, {"Gate entry", "Freight Amount", "indx"}),
    #"Added Custom" = Table.AddColumn(#"Expanded Count", "Result", each if[indx] =1 then [Freight Amount] else 0),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"indx"})
in
    #"Removed Columns"

Hi 

Can you see me My out put column If Multipule Gate entery  then Freight AMount single and 0 

to solve a problem in DAX you need an index or id column