Karen --
It is possible for each user to set up their My Timesheet page to log time
against the project as a whole, and not against individual tasks. Perhaps
that is what you heard previously. On the team member's My Tasks page, it
is not possible to log time directly against the summary task. Team members
must enter time against each task to which they are assigned, but not to
summary tasks.
On the other hand, if you want to both, you can enter Actual Work on summary
tasks in the Microsoft Project plan. To do this, open the project and click
View - Table - Work. In the Actual Work column, you can enter progress.
There is a limitation in doing so, however: the software assumes that the
task started and finished AS SCHEDULED, which may not be the case at all.
Therefore, I think this proves that all task statusing should be done on the
task level and not the summary task level. Hope this helps.