@Override
	protected Transferable createDragTransferable(List<SymbolRowObject> items) {
		List<Symbol> symbols = new ArrayList<>();
		for (SymbolRowObject ro : items) {
			symbols.add(ro.getSymbol());
		}
		return new SymbolTransferable(table, symbols);
	}
A class that provides the ability to start the dragging of {@link Symbol}s.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/symtable/SymbolTableDragProvider.java