I am thinking to user Groovy to create two customerized sub-menus, one for sub-tasks' creation and another for sub-tasks' update.
The sub-tasks' summary is like "'Sub 1 - %parent summary%", and assigned to a user, with user name from a fraction of the value of one parent tasks's customField, which is like "user1, 10, user 2, 11, user 3, 12". For example, the assignee of one sub-task is "user 1" (auto matched). And the estimation will be converted from "10"; assignee of anothe sub-task is "user 2", with an estimation converted from "11"
And once the parent's customerField is changed, we can use the "update" menu to update the assignee and estimation.
I am a newbie of Groovy, can anyone give some hint or idea how to do this? Thanks a lot in advanced!