Reference a table in Power Query Editor
In Power BI's Power Query Editor, referencing a table means creating a new query that is based on an existing query/table. This is helpful when we want to reuse a table but apply different transformations without affecting the original.
Let’s have the following query (table) named BaseTable in Power Query Editor.

 How to Reference a Table in Power Query Editor  Option 1: Using the UI (No Code)  Step 1: In Power Query Editor, right-click on the existing query (table) in the Queries pane. 
 Step 2: Select “Reference”. 

Step 3: This creates a new query that starts with the results of the original table. 
Step 4: We can rename it and apply new transformations independently. 

Option 2: Using M Code In the Advanced Editor, we can manually write:
Power Query M
let
    Source = ExistingQueryName
in
    Source  Here, replace ExistingQueryName with the name of the query (table) we want to reference.

Difference: Duplicate vs Reference
| Feature | Duplicate | Reference | 
|---|---|---|
| Copy Behavior | Creates a copy of the original query’s code | Creates a pointer to the output of the original query | 
| Independence | Independent copy | Linked — changes in original affect reference |