Avatar con diferentes roles

What you can do is use Generative Fill to change everything in the image besides the face. So, say you have a picture of a doctor, you could select the face only, selct inverse to choose around the face, and then type the prompt to create say a firefighter. It will be tricky to get the character to be wearing something on the face to represent the particular profession.

What you're asking for is not a current feature in Firefly. You can't create different versions of the same charcater with different prompts. You can type in a description of the character's appearance which can be the same in your various profession related prompts but Firefly won't gaurantee the person looks the same in each output.