Product Attribute

I doesnt understand how to import New products with Product Attributes

example
T-shirt
-----XL
------ S

We get a manufacturer file looking kindof like this:
gtin;Name
701010101;T-shirt XL
701010102;T-shirt S

How should the file look like on my part?

You need to use the next logic:
- import products
- create products product attributes or import them
- import product attribute  values for products