Referencing/Linking a Date to other Cells in the same sheet

Hi all,

I'm looking for assistance in linking a date to other date cells within the same sheet.

Here's my use case: I have my project milestone dates at the top of my smartsheet. Sometimes these dates change. When I change the project details date, I want the "launch date" to change in other cells within the same sheet too.

Is there a formula or way to link this? I have upwards of 2k rows, so manual copy/paste is not efficient.