ex.factory supports the following editing operations upon the Voice Arpeggiator Object shown within the Tree View of a Child Window:
To access all features other than Move, Copy and Set (which you do via "Drag and Drop"), right click over the Voice Arpeggiator to activate the Voice Arpeggiator's Context Sensitive Menu.
You can Copy/Move Voice Arpeggiators to/from Performance Arpeggiators as well as Voice Arpeggiators.
If the Voice resides in an S1A file, then a User Arpeggio from the same file can be dragged onto a Voice's Arpeggiator to set the Arpeggio used by the Voice.
Preset Arpeggios from the EX Synthesizer Window can be dragged onto a Voice's Arpeggiator as well.
Please note, the drag operation for this is COPY only. You cannot MOVE an Arpeggio onto an Arpeggiator.