How to manage TAX?

The price that I show is the price+VAT(10%). In the invoice, I would like the system to separate the VAT 10% out of the full price. For example, the price of product is 110. I want the system to separate the base price=100 and vat=10 on the invoice. How can I do it? Need help. Thanks.

I am talking about the one that I can access from the "Order". I clicked on the button "Invoice". Then, the invoice that lists all the detail of each item and lumpsum money with tax. I think it is the printable version of the invoice on the front end.