Hi @hassanmoukadem ,
If I understand correctly:
- You have an Excel sheet with a column that uses the Data Validation feature in Excel.
- The Excel sheet is connected to Power Apps.
- You want Power Apps to recognize the same Data Validation from Excel.
Power Apps does not retrieve the formatting or data validation from Excel.
As a better practice, if you would like to maintain the same validation between Power Apps and Excel, you can create a separate table in Excel that contains all the values.

When setting up Data Validation, choose to Allow "List" and set its source to the cells containing the choices you want:

In Power Apps, when adding data sources, add both the main table as well as the table(s) of options.
Then set the Items property of the drop down menu or combo box to the respective table.
Both Excel and Power Apps would reference the same choices this way.