Just select schedule from project finish in the Project Information page,
and input your tasks as usual, using FS links where appropriate to model
which tasks must preceed others. Project will calculate exactly the way you
want it to. Before you do that however, be aware that this is often a poor
choice for planning. Project will schedule the tasks at the latest possible
date that will let you finish on time. But because they are already as late
as possible, that means that is anything gets screwed up or runs late (and
something ALWAYS will!) you have no cushion to absorb the delay and still
finish on schedule. Planning from the earliest practical start date with a
finish deadline of your target completion date and scheduling to finish as
far ahead of that date as possible gives you far more leverage and
flexibility when it comes to working the plan.
