Your post is a bit ambiguous. "do i have to remove the front bumper to remove the front bumper" ??? But your post title says fender... That may be why no response yet.
If the question is fender - There is a strut from the fender to the bumper bracket that needs to come off. The valance on my '70 bolted to both fenders, so that would need to be unbolted at one end. and I would not know how to remove the fender extension from the fender with it on the car, but I think you will find some fasteners in behind the headlights to the extension that need to come off.