Indirect in data validation list

[drop05]

Hi i have the below formula in a list data validation but i am trying to include a option to "Select All" which is not in the column Code. Is there a way to add select all to the list for the data validation? The table is brought in from a Power Query so that option isnt included in the column
=INDIRECT("tbl_Master

")

 

[6StringJazzer]

Data Validation is in a cell, and a cell can have one value. So there is no option to Select All from a data validation list.

 

[drop05]

Data Validation is in a cell, and a cell can have one value. So there is no option to Select All from a data validation list.

Not selecting everything in the column just to selection an option called "Select All"

 

[6StringJazzer]

I see. How are you defining the list? Are you giving it a list of values, a range, or a formula?