Power Query: Control destination rows of the query

OliverScheurich , SimunovicS 

That doesn't work if table has more than on column. Alternatively we may

- add Index column

- Group By it without aggregation

- add row to each grouped table (to simplify only with [Index=""], when row will be with errors

- remove all but above columns

- expand it

- replace errors on blanks

let
    Source = Excel.CurrentWorkbook(){[Name="Tabelle1"]}[Content],
    #"Added Index" = Table.AddIndexColumn(
        Source,
        "Index", 0, 1, Int64.Type),
    #"Grouped Rows" = Table.Group(
        #"Added Index", {"Index"},
        {{"Count", each _, type table [A=number, V=text, Index=number]}}),
    
    // that adds the row with errors
    #"Added Custom" = Table.AddColumn(
        #"Grouped Rows",
        "Custom",
        each Table.InsertRows([Count], 0, {[Index=""]} )),
    #"Removed Other Columns" = Table.SelectColumns(
        #"Added Custom",
        {"Custom"}),
    #"Expanded Custom" = Table.ExpandTableColumn(
        #"Removed Other Columns",
        "Custom", {"A", "V"}, {"A", "V"}),
    #"Replaced Errors" = Table.ReplaceErrorValues(
        #"Expanded Custom", {{"A", ""}, {"V", ""}})
in
    #"Replaced Errors"

OliverScheurich Yes. Thank you. I need to go through all the steps, but the result is what I need. I ultimately need to combine several tables (e.g. one table to even, the other to odd rows, etc.), but his seems as a base approach. Any suggestions for a good book on Power Query?