https://help.tallysolutions.com/docs/te9rel60/Tax_India/VAT/West_Bengal/WB_Stk_Grp.htm

Creating Stock Groups (West Bengal)

You can create stock groups and assign state specific VAT rates to every stock group. Once the VAT rate is applied at the stock group level, all stock items under the specific group will reflect the tax rate assigned to the stock group. However, you can override this while recording a transaction.

To create a stock group

1.    Go to Gateway of Tally > Inventory Info. > Stock Groups > Create.

2.    Enter the Name of the stock group.

3.    Select the required group in the field Under.

4.    Enable the option Set/alter VAT details? to view the VAT Details  screen.

5.    Enter the relevant details in the VAT Details screen.

The Stock Group Creation screen appears as shown below:

6.    Press Enter to save.