Through the product management menu, you can batch update rates and availability.
In this example, I have three room types. I'm going to consider that I can sell the Twin and the Double at the same price.
1. Define the dates
2. Select the days of the weeks
3. Select the room types and the rate plans you need to update (here it will be the rates for the OTA)
4. Click on AMOUNT and set the price.
If you are using minimum stays, you can also define them at the same time (Here, it will be 2 nights).
Do not tick the checkin and checkout unless you are sure they are activated on your account.
5. Click on Update.
Always quickly check your rooms afterwards to make sure it did what you expected.