I must agree with the underlying reasons behind all of the responses that
would discourage you from doing what you have asked - especially since it
can't be done.
But assuming that you have a really good reason for asking (e.g., fixed
contract start dates for each project phase etched in stone...), I will
offer a technique that may accomplish your objective - make it look like you
had applied start and finish dates to the Summary. Here are the steps I
used:
1. On the summary task, create a deadline date matching the Finish Date you
are dictating and a "Start No Earlier Than" constraint with the Start Date
you are dictating. .
2. Update the Bar Styles to include display of the Deadline for Summary
tasks. (The deadline marker is not a constraint but a visual indicator of a
deadline, presumeably the date you expect to finish.
3. As the first task below the summary task, insert a new task, let's say
"Dummy Task", giving it a fixed duration to match the timeframe you desired
for the summary task so that the finish date aligns with the Deadline
indicator on the Summary task above it..
4. Create a filter to hide the Dummy task (you could use AutoFilter on Task
Name with "does not contain "Dummy Task"").
What you are left with is your original project, with a Deadline indicator
displayed on the Summary task. The summary task will be at least as long as
your Dummy Task, giving you the picture it sounds like you desire. If the
subordinate tasks extend beyond the Dummy task, the deadline indicator will
fall in the middle of your Summary bar, indicating that you are in trouble.
You could add constraints to prevent the subordinate tasks from ever
extending past the deadline but see all of the other responses to your post
before doing so. .
If this is being done just to show a "Picture" then it might be a useful
exercise. But if it is being done as a tool to help manage and track a real
project then this technique will tend to hide the reality of what is really
going on with the project.
Enjoy,
Jim Peters