You can enable VAT from Statutory & Taxation in F11: Features.
To create a company in Tally.ERP 9
1. Go to Gateway of Tally > F3: Cmp Info. > Create Company.
2. Press Backspace to modify the data path in the Directory field, if required.
3. Enter details pertaining to your company.
The Company Creation screen appears as shown below:
4. Press Enter to accept.
To enable VAT
1. Go to Gateway of Tally > F11: Features > Statutory & Taxation.
2. Set the option Enable VAT? to Yes.
3. Enable Set/alter tax/rate details?.
4. Enter the Tax/rate details, as required.
5. Enter VAT number.
6. Enter PIN.
7. Select the Type of Device.
8. Enter the Device number.
9. Click F12: Configure to view the Configuration screen to enable the option to set multiple devices.
10. Press Enter to accept.