Hi all! So I work in publishing and I basically have a template for the whole process, but I'd love to set it based on when the book launches. Is this possible?

(Example for clarity:

I have a book that's due out in, say, December 2020. I have a template for all the steps, and want to set the final deadline 'LAUNCH!' for the publication Date, and have it work backwards from that, even if it ends up being that some things are already overdue).