For a selected work item (user story, task, & etc), I would like to create a predefined set of sub tasks.

I would like to add a menu item so that when I highlight a work item, I can select "Create Predefined Tasks". Afterwards, a panel would be displayed similar to the following:

#Name of selected work item
#Category of selected work item

Documention:
Test:
Web UI:

The work items would be created after selecting the user for each task and submitting. Is there a good example or reference for extending the Eclipse UI to accomplish this? In particular, how do I retrieve a set of team members corresponding to the category of the selected work item?