First of all, here's a video explaining the subject:
We recommend that you only use this function if absolutely necessary: once the new prices have been set in the Schedule, they will "take precedence" over the prices indicated in your Offers; changing the prices in your Offers will therefore no longer have any impact on the periods for which the prices have been modified since the Schedule.
To make a Quick Price Change in the Schedule, follow these steps:
Click on Schedule in the Main Menu,
Click on the offer of your choice on the My Schedule page ,
Click on the Quick Price Change link
Select the Offer you wish to modify
Select the price calendar concerned (by default, that of the current year)
Select the type of pricing set up in your offer (per service, per combination, etc.)
Use the mouse to select the relevant period:
Day by day, by clicking on the given days
Week by week, by clicking on the week number
Month by month, by clicking on the cross to the left of each month
You can also combine specific days with several weeks and one or more months
Set the new Price
Then click Apply
Note: Just as you can make a quick change to prices, you can also make a quick change to availabilities.