days between Task and total

Please see the attached file and the applied steps in power query, but here's the code:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8sxLzkxJzStR8CvNTUotUtJRCkkszgZSwSWJRSUKLoklqUCOa14KjKmgFKsTrWRoYGAA5BiCsL6hvpGBoSWYaQpjoigzAsuZIZQZGmBVZwyRNEUoNEJTqABmIWOQqBGya4yQ3ICmAOIOY7iZRgino6gzBssZI5QheysWAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t, Column3 = _t, Column4 = _t, Column5 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", type text}, {"Column3", type text}, {"Column4", type text}, {"Column5", type text}}),
    #"Promoted Headers" = Table.PromoteHeaders(#"Changed Type", [PromoteAllScalars=true]),
    #"Changed Type1" = Table.TransformColumnTypes(#"Promoted Headers",{{"Incident Number", Int64.Type}, {"Task", Int64.Type}, {"Start Date", type date}, {"End Date", type date}, {" ", type text}}),
    #"Removed Columns" = Table.RemoveColumns(#"Changed Type1",{" "}),
    #"Filtered Rows" = Table.SelectRows(#"Removed Columns", each ([Incident Number] <> null)),
    #"Sorted Rows" = Table.Sort(#"Filtered Rows",{{"Incident Number", Order.Ascending}, {"Task", Order.Ascending}}),
    #"Grouped Rows" = Table.Group(#"Sorted Rows", {"Incident Number"}, {{"All Rows", each _, type table}}),
    #"Added Custom" = Table.AddColumn(#"Grouped Rows", "Custom", each Table.AddIndexColumn(
[All Rows],
"Index",
1, 1 )),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "Custom.1", each Table.AddIndexColumn(
[Custom],
"Index2",
0, 1 )),
    #"Added Custom2" = Table.AddColumn(#"Added Custom1", "Custom.2", each Table.NestedJoin(
[Custom.1], {"Index2"}, 
[Custom.1], {"Index"},
"Merged",
JoinKind.LeftOuter)),
    #"Added Custom3" = Table.AddColumn(#"Added Custom2", "Custom.3", each Table.ExpandTableColumn([Custom.2], "Merged", {"End Date"}, {"Prev End Date"})),
    #"Added Custom4" = Table.AddColumn(#"Added Custom3", "Custom.4", each Table.Sort([Custom.3],{{"Task", Order.Ascending}})),
    #"Added Custom5" = Table.AddColumn(#"Added Custom4", "Custom.5", each Table.AddColumn(
[Custom.4],
"End Date Use",
each
if [End Date] = null  then null else if [Prev End Date] = null then [End Date] else [Prev End Date] )),
    #"Added Custom6" = Table.AddColumn(#"Added Custom5", "Custom.6", each Table.AddColumn(
[Custom.5], 
"DaysBetween",
each if [Prev End Date] = null and [Task] = 1 then [End Date] - [Start Date] 
else
[End Date] - [Prev End Date]
)),
    #"Removed Other Columns" = Table.SelectColumns(#"Added Custom6",{"Custom.6"}),
    #"Expanded Custom.6" = Table.ExpandTableColumn(#"Removed Other Columns", "Custom.6", {"Incident Number", "Task", "Start Date", "End Date", "DaysBetween"}, {"Incident Number", "Task", "Start Date", "End Date", "DaysBetween"}),
    #"Changed Type2" = Table.TransformColumnTypes(#"Expanded Custom.6",{{"Incident Number", Int64.Type}, {"Task", Int64.Type}, {"DaysBetween", Int64.Type}, {"End Date", type date}, {"Start Date", type date}})
in
    #"Changed Type2"

You really dont want to have totals/subtotals built into the tables ( there are specific situations where you would though) so just better to let the visuals take care of the totals

Here's the file:

https://1drv.ms/u/s!Amqd8ArUSwDS0AvvfmqTtcjGCqmj