In your platform, head to Admin --> Pricing --> Rate Cards
Select the relevant rate cards you would like to increase by using the tick box on the left, and click "Bulk Replace".
The Bulk Replace modal will pop up, so you can choose the date your increase will be effective from, the price change percentage, and the decimal places to round this increase to.
**NOTE the platform will only load 1024 rate cards at once. If you have more than 1024 rate cards in the platform, then you will need to narrow down by customer first, then bulk replace customer by customer.