I have a dataset in which there is a column which might consist of duplicate values, I dont want to remove them but I want to treat them. So i need to make a new column that will provide me with result saying that this data is duplicated.
Tile Tool (alteryx.com) will be your best bet!
The Unique Value method will act like a "mark" of duplicate rows: Tool Mastery | Tile - Alteryx Community ensemble kachel