Before setting up your task lists, make a list of all the milestones in your project. Then put a date by each one and whose responsible for that milestone. Being responsible doesn't mean everyone who has a task in that milestone, it means whose in charge of getting these tasks done, such as the lead carpenter or the supervisor. Here's how to add some milestones.
Shifting a date in Milestones - Schedules rarely are perfect. Many time they must shifted due to a rain or material delay, or labor shortage. Instead of re-writing the whole schedule over, all you have to do is change the date on the Milestone in question and everything else shifts with it.