To Add a Task

In the Customize dialog on the Tools tab, expand the Tasks tab.
Expand the User Tasks section.
Do one of the following:

Select the open DGN file.

or
Expand the open DGN file and select the task into which you want to add the new task.
Do one of the following:

Click the New Task icon.

or
Right-click the open DGN file or task and select New Task from the pop-up menu.

or
Click and drag a custom toolbox from the left pane to the open DGN file, task, or workflow in the Tasks tab.

A new task appears with the name "New Task."
Type a name for the new task.