We presume that this is a side-by-side duplex. and that the local zoning and land-use regulations allow for this sort of partitioning.
One thing to consider is that this might be an especially difficult property to sell, particularly because it will be difficult to appraise, and right now, Appraisals Rule.
It would also be fabulously useful to have a joint maintenance agreement prepared, especially because you have (at least) a common wall and roof. If you have any other connected services, like water or sewer or electrical, you'll probably want to include those, as well.
Yes you can sell half a duplex. Each half is considered a separate property that has a separate title and deed.
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