How to change de form of the some content type?

I have a type of content products with a brand, that is a taxonomy and other content report type in which when selecting a brand I show the products related to that brand in with checboxes to mark more than one. What I need to do is give you the possibility to create a report to mark the data fields of the product that I want to show in the node. Example: for each product that gives you the option of which fields to print of that product. Product 1: title and body, product 2 body and so on with all the products that you mark. But I have no idea how to do that, thanks in advance.

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