Ref https://www.irs.gov/instructions/i709#en_US_2024_publink16784xd0e1331
Make sure to check the box in Schedule A and include the rrequired attachment. You do not have to file a 709 in the 4 future yesrs unless you make additonal gifts.
Use the total amount of the gifts made in 2024 for Part 4 with the total exclusion.
