Is there a way to change the rate for a role from a particular date without affecting the historical data?

To change the rate for role with effect from a particular date, follow the steps given below:

• Log into Web TimeSheet with appropriate permissions to edit the Project and rates.
• Click on the Project tab on the top menu.
• Edit the project that you want to make the changes to.
• In the Billing Rates column click on the Default Rate history icon (represented by a Book).
• Click on the Add.
• Set the effective date from when the new rate should be effective from and then new rate.
• Click on Save.