You need to export both Mobs and MobItems tables from your server's DB, to CSV format.
Open your DB in Management Studio and right click those 2 tables and choose Tasks > Export Data
Then export them as CSV (with column headers and delimited with ,).
Then open Monster.SData in ShaiyaStudio, and go to File > Import, and import both CSV files (Mobs.CSV and MobItems.CSV), after that just Save the Monster.SData file and it will show all data now.
Reference:
Or, you can just edit those % directly on the table itself, inside of SQL Management Studio (or better, using Navicat, wich is lighter and faster than Management Studio)