Need help with a google doc

Instead of description, change it to timeline and then add a column for calendar or dates that will adjust or change if you reduce or add days in the timeline column.
Basically it's like a calendar in goolge doc format.
see attached photo.

https://docs.google.com/spreadsheets/d/1W06XIv4ZPSMLhPxAsxNeDsI3A0fx-6xdU8UW0tugYT4/edit?usp=sharing

I need it in 12 hours.

Thank you