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A Concrete Professional or perhaps even a Mason will be able to help you. Heck, almost any professional that does 'general work' should be able to help.
Yes, you can do one section, but if you plan on doing pavers or bricks, do you need to need to have the section replaced? I mean, if you can landscape on the sides of the walkway, then you can 'box' the bad section (after it's removed) with timbers or more bricks, then just do a 'normal' install for what you want to do. The major question I have here is what's the CAUSE of your upheaval? Is it tree roots? Is it freezing and thawing? Or what? The point is - No matter what you end up doing, you may be back down this road again later on unless you fix the CAUSE.
My best to ya and hope this helps.
Jay J -Moderator