sy.factory supports the following editing operations upon the Voice Microtuning Unit 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 Microtuning Unit to activate the Voice Microtuning Unit's Context Sensitive Menu.
Preset Microtunings from the SY Synthesizer Window can be dragged onto a Voice's Microtuning Unit. Please note, the drag operation for this is COPY only. You cannot MOVE a Microtuning onto an Microtuning Unit.
You can also drag User Microtunings from the same file onto the Microtuning Unit.