Combine values from multiple rows

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WSixOSVPSUTIE4pDM5OzUEhDHyBhI5pXm5MCoWB0UlUGpicX5eQg1SanJiaXFqThUOxelJpakpqAZqaNkZGBkomtoAEQYOnLyi/FpMARrqKisAgoaI7vc1NQUi8sRCtEdXp5RqZCXX4JdMR53G+saGAKRUmwsAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Group = _t, Name = _t, Ticket = _t, Reason = _t, DateTime = _t]),
    #"Replaced Value" = Table.ReplaceValue(Source,"null",null,Replacer.ReplaceValue,{"Ticket", "Reason", "DateTime"}),
    trans = (tbl)=>
       let
           #"Removed Other Columns" = Table.SelectColumns(Table.AddColumn(tbl, "Value", each List.RemoveNulls({[Ticket],[Reason],[DateTime]}){0}),{"Name", "Value"})
       in 
           Table.Pivot(#"Removed Other Columns", List.Distinct(#"Removed Other Columns"[Name]), "Name", "Value"),
    #"Grouped Rows" = Table.Group(#"Replaced Value", {"ID", "Group"}, {{"Rows", each trans(_), type table [ Ticket=nullable text, Reason=nullable text, Created=nullable text, Closed=nullable text]}}),
    #"Expanded Rows" = Table.ExpandTableColumn(#"Grouped Rows", "Rows", {"Ticket", "Reason", "Created", "Closed"}, {"Ticket", "Reason", "Created", "Closed"})
in
    #"Expanded 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 Source step with your own source.

Consider the next data in power query

Select the columns Ticket, Reason, and Date time then right click on one of them and pick unpivot columns to reach next image.

then on the value column filter non null values and also remove column Attribute to reach the next image

now select Name column and from transform tab pick pivot column and make the next setting to solve the problem.

the result would be like the next image

here you can find the whole code

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WSixOSVPSUTIE4pDM5OzUEhDHyBhI5pXm5MCoWB0UlUGpicX5eQg1SanJiaXFqThUOxelJpakpqAZqaNkZGBkomtoAEQYOnLyi/FpMARrqKisAgoaI7vc1NQUi8sRCtEdXp5RqZCXX4JdMR53G+saGAKRUmwsAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Group = _t, Name = _t, Ticket = _t, Reason = _t, DateTime = _t]),
    #"Unpivoted Columns" = Table.UnpivotOtherColumns(Source, {"ID", "Group", "Name"}, "Attribute", "Value"),
    #"Filtered Rows" = Table.SelectRows(#"Unpivoted Columns", each ([Value] <> "null")),
    #"Removed Columns" = Table.RemoveColumns(#"Filtered Rows",{"Attribute"}),
    #"Pivoted Column" = Table.Pivot(#"Removed Columns", List.Distinct(#"Removed Columns"[Name]), "Name", "Value")
in
    #"Pivoted Column"

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Looks like my original code produces that result

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WSixOSVPSUTIE4pDM5OzUEhDHyBhI5pXm5MCoWB0UlUGpicX5eQg1SanJiaXFqThUOxelJpakpqAZqaNkZGBkomtoAEQKBoZWBgZAhKE1J7+YdJ1GyJ4xNTXF7RkjLJ4pz6hUyMsvwaGaTM8YEeEZI1SdFZVV6BGD3S8IhUR4BaEYj0+MdQ0MgQibe4gIW4RCot1DTsgi6cQZsMYYARsLAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [ID = _t, Group = _t, Name = _t, Ticket = _t, Reason = _t, DateTime = _t]),
    #"Replaced Value" = Table.ReplaceValue(Source,"null",null,Replacer.ReplaceValue,{"Ticket", "Reason", "DateTime"}),
    trans = (tbl)=>
       let
           #"Removed Other Columns" = Table.SelectColumns(Table.AddColumn(tbl, "Value", each List.RemoveNulls({[Ticket],[Reason],[DateTime]}){0}),{"Name", "Value"})
       in 
           Table.Pivot(#"Removed Other Columns", List.Distinct(#"Removed Other Columns"[Name]), "Name", "Value"),
    #"Grouped Rows" = Table.Group(#"Replaced Value", {"ID", "Group"}, {{"Rows", each trans(_), type table [ Ticket=nullable text, Reason=nullable text, Created=nullable text, Closed=nullable text]}}),
    #"Expanded Rows" = Table.ExpandTableColumn(#"Grouped Rows", "Rows", {"Ticket", "Reason", "Created", "Closed"}, {"Ticket", "Reason", "Created", "Closed"})
in
    #"Expanded Rows"