Creating a auto fill schedule

Hello all, this is my first thread so excuse my thread ethics....still learning

I am looking for an easier way to schedule construction projects.
Each project is composed of the following

Design-2 days
Drawings-5 days
Material Takeoff- 1 day
Production- 10 days
Delivery- set date provided by client

Typically I fill in the delivery date on a gantt char, and work backwards for the preceding items.
Is there a way to select the delivery dates and have the preceding date automatically fill in based on duration parameters I set ?

In actuality there are 30+ jobs, and most durations take months not days, so manually filling in the gantt chart is a pain.

I have been playing around with conditional formatting but to not understand enough to make it all function.

Thanks!