Please follow the steps outlined below.
0. Save a back-up copy of the file. This is recommended before making any modifications to the template.
1. Unhide HELP sheet
2. Go to cell AH1007.
3. You should see the small triangle in the right bottom corner of cell AG1005.
4. Click and drag that triangle down to more rows as needed (if you need 100 more employees, drag it down to cell AG1105).
5. Hide the HELP sheet.
6. Save the file.
7. Test the dashboards and make sure that more than 1000 employees are accommodated.