@cisloisa
Hi,
You can do so using Get & Transform Data (aka Power Query) by creating a query from each table in the other sheets, then append all queries tables into one table.
After then, you can remove the duplicates from the table and then load it to the Master worksheet.
This is what I did in the attached Example workbook.
Please download it and test it by adding the same company in Sheet2 and Sheet3, then go to Master, Right-click the table and select Refresh and see the result.
To learn more about the Append process in Power Query, please check out this video.
Regards