If you've already set up prices for one client and need to apply the same pricing to another, you can copy them in a few clicks instead of adding each price manually.
Go to Profiles → Clients.
Click on the client's name.

Open the Destinations tab.
Click Show all in the Prices block.

In the window that opens, click Import prices from another account:

In the window that opens:

Select the client whose prices you want to copy from the dropdown and click Import.
All prices from the selected account will be copied to this client immediately.