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Thank you very much for your help.

Does TT have any plans to modify the software to allow partial asset dispositions without the need to keep separate written records for the prior basis? For example, one solution  would have been to enter a new asset entry with a negative basis asset for the old replaced roof and override the remaining asset life on this negative value asset to the remaining 13 years. ....but TT wouldn't allow me to enter negative value new assets.

I'm surprised that this partial asset disposition is not a very common problem.  Especially since  2014, the IRS allows choosing  partial asset dispositions even when casualty losses or insurance payments are not involved.