From where i can configure tax Creation?

As per government rules tax is applicable on an item and in eZee Optimus first, we need to define tax first.

1) Switch to back and select tax tab under Master menu and click on "+" sign available at top right of your screen to define tax name. 

2) Once you define tax select Tax Group option available under Master menu tab and create a tax group as per applicable on items category. for eg. : Food tax and Beverage tax. 

While adding Tax Group enter tax group name and then select Apply tax which you define under tax tab.