1- Donwload the Excel Template from the webpage
2- Enter your historical projects in tab "input"
3- Then, click on "Data" at the top ribbon, then click on "Solver"
3a- If you don't see "Solver" then click on: file->Options->Add-ins->"Go"-> check "Solver Add-in" -> click "OK". Then close the Excel file and open it again
4- Once the solver finishes, switch to the "Results" tab
5- Select all the values in Results and copy them
6- in the webpage, paste the results in the "Advance" box and specifiy the number of cost drivers used in your projects
7- click on "Update" button