U will need to disconnect the 12v supply for the bell box from the control panel, and also disconnect the bells internal battery. And link out the tamper return if u will be needing to use the alarm in the meantime
When you are programming the code in the manager area, when going through the options you will set which areas the user has access to. So select C only
Yes that sounds good. Did u take the device to the panel location and check the signal ? You will also need to recalibrate the shock sensor if you can get it learned back on. Arrow on inertia barrel should be pointing upwards and 1 click negative before u do this.