Requirement: Reach level 60
Go to NPC Blacksmith and buy an Equipment Transformation Scroll (Price: 100 gold)
After that, open Backpack, double click to use. After selecting equipment you want to transform and what equipment what you want it to be, you can click Confirm to process.
Equipment will have the same enhance and craft level after transformation.
You can transform between 2 weapons or 2 necklaces