Outlook has two accounts, how to assign them to an account calendar when adding holidays?

I'm also thinking about how to import the target customers directly. Here's how to transfer from another account to the target account:

Open outlook- > calendar-> Search for "holiday" in the search box in the upper right corner-> in the top column of the list that appears, arrange it in ascending order according to the starting column-> Select the date to start, hold down the shift key and select the end date at the same time, thus selecting a period of time (don't choose too long at a time, or outlook will be down during processing)-> Move-> Other folders-> Click the email account you want to deposit-> Select the calendar folder-