John --
Priority numbers can be set at both the project level and the task level.
To set a Priority for the project, click Project - Project Information, and
set the Priority number to a value between 0 (lowest) and 1000 (highest - do
not level). To set a priority number for a task, double-click the task, and
on the General page of the Task Information dialog box, set a Priority value
between 0 (lowest) and 1000 (highest - do not level).
IMPORTANT NOTE: When you level, if you want the Priority number to be the
first factor in the leveling process, you will need to set the Leveling
Order to "Priority, Standard" in the Resource Leveling dialog box.
If you attempt to level resource overallocations across multiple projects
using the software's built-in leveling tool, Microsoft Project 2002 will
first compare the Priority number of the project, with the highest priority
project getting the scarce resource first. If two projects have the same
Priority number, then the software will compare the Priority number of the
impacted tasks, again with the highest priority task getting the scarce
resource first. If the overallocation is occuring in a single project only,
then the software will compare the Priority number of the impacted tasks,
again with the highest priority task getting the scarce resource first. If
the Priority numbers are identical for all impacted tasks, then the software
will use other factors, such as Predecessors or Constraints, to determine
which task gets the scarce resource first.
Hope this helps.