@Kathy1444
Ok...I see. The only way to add information to blocked dates from another site is to add a note to those dates. Airbnb used to have an at a glance view for notes. Unfortunately, they removed that feature in the Summer 2023 release.
Now you can add a note in the right panel and a black dot will appear on the calendar date indicating you have a note. You will still have to click the private note area to view the note. If you use pro tools and the multicalendar, if you hover over a date, the notes will appear.
Unfortunately, after the dates have past, you cannot access your notes any longer if the reservation was outside Airbnb. Airbnb reservations details will still show the note when the date is past, but you cannot access the note on the regular calendar; you have to go to reservation details to see it.
Many Hosts have had to setup a separate calendar (Google) to enter their notes regarding bookings outside of Airbnb.