To create stock item with service tax details, enable statutory option for stock items in the company's F11: Features > Statutory & Taxation.
To create stock item
1. Go to Gateway of Tally > Inventory Info. > Stock Item > Create.
2. Enter Name for the stock item.
3. Select group in the field Under.
4. Select Units for the stock item.
5. Enable Set/alter service tax details? to view the Service Tax Details screen.
6. Press Enter to save.