Jeff; The ability to do just what you are asking is a feature we’ve been asking Microsoft to add for years. Meaning while their enterprise Max units is 100%, provide the ability to define project level max units at 60% for example, and then let the default task assignment units to stay at 100% (which would be 100% of 60%). As Larry noted, you can change the Max Units in the resource list for enterprise resources, and this remains in effect for that session. This makes it usable for initial schedule entry since the Resource Max Units becomes the task level assignment units by default when adding a resource to a task. However, as indicated, Project resets your resource list entered value and resets it to the enterprise max units value every time you open the schedule (for enterprise resources only). Essentially, the only way to do what you need is to ensure that the task level resource assignment units value is set at (or below) what you want that resources availability to be for that project engagement… on every task. You can set up a resource usage view showing both the resource level max units and the task level assignment units, grouped by resource. This gives you a quick view to easily view/scan each resource across all tasks on which they are assigned.