Step 1: Export one allocation to have the correct fields prior to import.

Step 2: Modify your allocation from hours to days based on your working schedule (for instance, for a 40-hour week with an 8-hour day, divide the hours by 8 to get the correct number of days to allocate).

Step 3: Import the allocation based on your new column 

You now have the allocation that you want to mass confirm, since you can't forcibly change the state of the time-off you have to create a server action.

Step 4: Create a server action to mass confirm the allocations

- Go into developer mode and go to the server action menu

- Create the following action

You can now mass confirm allocations and then, if you have the necessary access rights, mass approve them.