Dave --
You are making this process way too hard, and you should definitely not ask
your team members to self-assign themselves to tasks in the admin plan.
Instead, do the following:
1. Open your administrative project
2. Click Tools - Build Team from Enterprise
3. Select all of your human resources and copy them to the project team
4. Click OK
5. Select all of the tasks in the admin plan
6. Click the Assign Resources dialog button
7. Select all of the resources in the dialog and click the Assign button
8. Click the Close button
9. Save and publish your admin project
That's the easy part. The problem you will face using an admin plan for
this purpose is that Project Server will not automatically reschedule
assigned work for resources when they submit nonworking time such as
vacation. For example, if I am assigned to work on tasks in a regular
project during the week between Christmas and New Years, and then I submit
vacation to your admin plan during that time period, Project Server will not
reschedule my task work to the week after New Years. If that is the
behavior you wish to see in Project Server, you should dump your admin plan
and enter each person's vacation on their personal calendar in the
Enterprise Resource Pool. You can't do both, however, so your organization
should make a decision about whether to use an admin plan to track
nonworking time, or to enter nonworking time in the Enterprise Resource
Pool, and then stick with that decision. Hope this helps.