Hi, You're going about this the wrong way. Phasing requires you to place elements in different phases. You can actually completely demolish a wall and replace it with another wall in the same location without having any warnings. Look at the bottom of the instance properties. There are two parameters, one for phase created and another for phase demolished. Also every view has two parameters, one for phase filter and another for the phase. Additionally, to control how phases look, go to manage ribbon, and click on phases tool under the phasing panel. This should allow you to set the phases, phase filters, and graphics overrides of phases.
Best of Luck,
Ali Al-Hammoud Structural Design Engineer MZ & Partners Engineering Consultancy