To Add a Key-in to an Explorer Context Menu Item

In the Customize dialog on the Tools tab, expand the Explorer Context Menus tab.
Expand the open DGN library.
Expand context menu as needed to get to the context menu item to which you want to add a key-in and select it.
If the selected context menu item's key-in property is not visible in the Properties pane, click the arrow on the right side of the Command Data tab.
In the Key-in text field, type a new key-in.
Note: You can use any key-in. The key-in may open a dialog, activate a tool, run a macro, etc.