Thanks! It's definitely something I want to add. A UI for managing content between multiple resumes can get complicated fast, so I'm still working through the UI sketches. But I agree, I think it would be a killer feature.
As an intermediary feature, perhaps a show/hide toggle on each bit of content would allow you to customize the resume without removing the information from Creddle. Then after exporting the resume, you could modify what content is hidden for the next employer.