Delete rows for some columns to align the data

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("nc9BCsMgFEXRvTh28t9bQdroJiQ7CJ11/613GD4BM7mCPNAzRomt1BKvfz7f88yPo47LdbxjdqeN9kh3Ykcb7Up3Zkcb7U5293/UtGjVIizCIixKLcIiLMKi1CIswiIsemDxtHjVYizGYixOLcZiLMbi1HLz9vED", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Column A" = _t, #"Column B" = _t, #"Column C" = _t, #"Column D" = _t, #"Column E" = _t, #"Column F" = _t]),
    #"Replaced Value" = Table.ReplaceValue(Source,"null",null,Replacer.ReplaceValue,{"Column A","Column B","Column C","Column D","Column E","Column F"}),
    #"Filled Down" = Table.FillDown(#"Replaced Value",{"Column A", "Column B"}),
    #"Filtered Rows" = Table.SelectRows(#"Filled Down", each ([Column C] <> null))
in
    #"Filtered Rows"

How to use this code: Create a new Blank Query. Click on "Advanced Editor". Replace the code in the window with the code provided here. Click "Done". Once you examined the code, replace the entire Source step with your own source.