First get Shaiya DataFileTool by lilprohacker:
Then get Shaiya Data Edit by Zerosignal:
Also download Python from link above.
1. Extract Shaiya Data Edit in the Python folder
2. Run Data File Tool and open data.sah from your Shaiya Folder
3. Extract cash.sdata
4. Still using Sata File Tool do File Decrypt and select Cash.sdata
5. Copy or cut Cash.sdata and put it in Python27\Input\SDATA
6. Then go to Python27 and run Cash_csv.bat
7. Go to Output and you can modify you Mall there.
Once the Modification are complete use Cash_sdata.bat and just put it back in game.sah