I need to show a product with multiple variations, but not to be sell as a grouped product. The variations must be sell individually. To understand, i need to copy this configuration:
I think you're looking for a configurable product?
These can give you the option to choose a variation of the product. For example you could have a t-shirt that's has different colours and sizes, the user can choose any combination:
See the configurable product guide here - http://docs.magento.com/m1/ce/user_guide/catalog/product-configurable.html