You can adjust multiple rates once in System -> Rates by clicking the Renew rates button on the blue action bar.
This is especially useful if you are adjusting all prices to account for inflation or changing market conditions.
Rate renewal has three steps
After clicking Renew rates on the blue action bar in System -> Rates you’ll see the following pop-up
To find all of the rates you want to adjust you can select one, or multiple, of the following criteria
After selecting criteria click Search
A new pop-up opens showing all of the rates matching your search criteria
You can select all of the rates you want to adjust by ticking them in the first column. Once you have selected all rates you want to adjust click Renew rates
A new pop-up window will appear for the final step
Here you can specify how the rates are adjusted
When you are satisfied click Renew
[Info] This process creates new rates, the only change to the pre-existing rates is the addition of a Valid to: date. The old rates will not be adjusted in any other way, or deleted.