using a current value for a column from Previous STEP - Power Query

Hello Experts,
My business need with Power Query :
I'm tried to save the same values in the columns (id_bu_rh) and (id_bu_ctr) ( a completed list of id) : for these reason i created the step Duplicated Column .
after i have a modification step called #"distinct annee, mois" : this is essential for work (but this step affects (id_bu_rh) , (id_bu_ctr) which become only with values : (0,1))

So I want to make a step that combine the columns
of #"distinct annee, mois" with the columns (id_bu_rh) , (id_bu_ctr) in the previous step Duplicated Column (or navigation)

this is my code this my power Query code and i think I am close to the result : just to fix how to call an element value (column) from a previous step :

let
Source = PostgreSQL.Database("localhost", "datamart"),
polaris_datamart_fait_ca = Source{[Schema="polaris_datamart",Item="all_combinationations_v"]}[Data],
#"Duplicated Column" = Table.DuplicateColumn(polaris_datamart_fait_ca, "id_bu_rh", "id_bu_rh - Copy"),
#"distinct annee, mois" = Table.Distinct(#"Duplicated Column", {"annee", "mois"}),
#"step_final" = Table.AddColumn(#"distinct annee, mois","col_bu_RH", each (#"Duplicated Column"[id_bu_rh]))
in
#"step_final"

( amitchandak   , selimovd   parry2k  , Greg_Deckler  Pragati11  MarcelBeug v-qiuyu-msft 

 and all community of super stars , i need your helps ). BEST REGARDS

This is my screenshots below