How to add custom fields in onestep checkout magento 1.9+

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please, I need to know how to add custom fields in the magento's one step checkout billing address, such as: DNI, and 3 selects with department, province and district. This selects are customized by me, but I need to put them in the billing address. I want to know how to do that, step by step, if it's posible, with images.

I'll attach a screenshot.

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