I posted in another thread on same problem of my inability to modify a prior Form 4797 entry with TT Online, then I found this more recent thread. Following your instructions to check button "Sales of business or rental property that you haven't already reported" (my emphasis) and then to step through the input screens does not bring up/display my prior entry of a sale I want to modify as you indicate. This only allows me to enter more sales (which I can edit/delete). So this menu is for only what it says - new entries - and does not provide any access to prior entries of 4797 sales. I suspect this lack of access to prior entries is not going to be fixed in the near future?
