Combine tables

[JackDanIce]

Hi,

I have four identical columns and wish to combine them into a master table where:
I add a column to each table
Fill this column with the table name
Apend and repeat

Query is called Single_Table and so far I have:

(table_name)=>
let Source = Table.ReorderColumns(Table.AddColumn(table_name, "Book", each table_name),{"Book", "Ledger", "Operation Unit Code", "Operation Unit Name", "Country", "Amount (CAD)", "TPM", "Comment"})
in
    Source

But I can't get the table name to fill a blank column.

After this, I wish to create a table like:

source = Table.Apend(Single_Table("Sales"), Single_Table("Purchases"), Single_Table("Revenue_Earned"), Single_Table("Revenue_Expensed")

How can I use the table name as a value for a column add?

TIA,
Jack