In the
Navigation dialog, browse to the folder that
contains the part you want to modify.
In the
Selection dialog,
right-click > Edit User
Part Data.
The user part opens in a new DGN.
Make your changes to the part drawing.
Tip: In
addition to changing the part itself, in the
Selection dialog
you can also
right-click > Add
Insertion PointsData to add new, additional insertion
points to the part.