I am struggling around and didnt get the right idea how to:
I am only like to add automatically a column to an existing table and fill this column
with the same customer number for all rows that existing in this table.
In the case the value you want is not constant, and it is coming from another branch of the workflow
or variable , (date of execution, for ex) .
It can be solved by adding the value with the column a apender + missing values tool as bellow