Switching Cabs in Rig Manager?

All your Cabs are seen as presets in RM3. Look in the Preset part of the panel on the left side.

Then you can just drag and drop that on to the Cab part in the editor panel.

another option is to lock everything except either the Amp or Cab block and drag a full rig into the editor. For example if you lock everything except the Cab, this will have the effect of substituting the cab only for another rig.

Perhaps the most simple solution is to double click the cab in the presets folder and it will load it into the rig. This way you can very easily compare cabs..

The problem is that there is currently only 1 cab preset in the factory content and rig exchange doesn't currently store presets. Even in my local library there is only a total of 19 cab presets out of 655 presets. Therefore, unless you make a preset from rigs or buy cabinet packs from somewhere you have limited ability to use the double clock or drag and drop preset methodology at the moment. Whereas, locking the amp or cab and dragging or double clicking a rig lets you try any cabinet with a single amp or any amp with a single cabinet.