Custom post type – multiple separated images

Hi, i am trying to crate theme with custom post type and i am almost done. But i don’t know how (or if its even possible) to create 2 separated boxes for uploading image in my custom post type. I want to have 1st as featured image (can be featured image itself), 2nd “hero promo” which will be used as backkground at the top of the post. I tried to search google but didnt found any solution. Do you have experience with that?

Thanks Vitek