Two things. First, you will need a macro to trace all the predecessors to
that exact task and then (2) filter to only those tasks. I believe Rod Gill
has a Macro to do something similar in his book which is available from
msprojectexperts.com
Another choice (the one I use) is a third party product called Pert Chart
Expert. What you do is select the task, click the PERT Chart button and then
you can trace from there with two mouse clicks. The product is not expensive
and works well.
Using the Network Diagram in the bottom pane may work for you. However,
this will display all tasks visible in the upper pane and you need something
to filter our the "path to this task" as well. If you can live without the
extra filter and do it with your own eyes, then Jose has your immediate
solution.
If you are using Project 2007, use the "What is Driving my task?" feature,
it will give you the single task or infomration that is driving that task.
P2010 will be more robust in this area but will also only identify the single
task.
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If this post was helpful, please consider rating it.
Jim Aksel, MVP
Check out my blog for more information:
http://www.msprojectblog.com