Schedule C would not be used to report rental property activity. 4797 reports the sale of business property, which includes the sale of rental property. A sale is not reported on Schedule E itself- only the rental income and expenses (including depreciation) go on Schedule E. Schedule C is for a self-employed business, independent contractor work, etc- just not rentals.
While we are not discussing the specifics of the figures, there's no indication of a problem other than your attempt to use a Schedule C for rental property.
As far as dividing, there are no "special" forms for that, but the cost (basis) and sales price/ sales expenses would generally need to be split manually. Your own level of effort also depends on whether you have the depreciable asset in the program with these allocations already- this could vary from user to user. Have you been reporting 50% of everything in the program all along?
After reviewing the Form 4797s, please re-post if you see specific problems.
