In DAZ figures such as V4, The Girl SP3, etc, that have PBMCC_## and PBMDC_## channels it is more usual to REM the channels you don't want. This removes any morph deltas from the channel, and hides the associated dial, but leaves the channel itself in place so it can be used for future morph injections. Below is an example of a REM pose that REMs the PBMCC_30 channels in the chest and abdomen, and (partially) initialises the PBMCC_30 FBM (valueParm) channel in the BODY. You can make your own REM poses in a text editor. {

version
        {
        number  3
        }

actor BODY
        {
        channels
                {
                valueParm PBMCC_30
                        {
                        name -
                        hidden 1
                        keys
                                {
                                k 0 0
                                }
                        }
                }
        }

actor abdomen
        {
        channels
                {
                targetGeom PBMCC_30
                        {
                        name -
                        hidden 1
                        indexes 0
                        numbDeltas 0
                        }
                }
        }
actor chest
        {
        channels
                {
                targetGeom PBMCC_30
                        {
                        name -
                        hidden 1
                        indexes 0
                        numbDeltas 0
                        }
                }
        }
}

If you do want to completely delete morph (targetGeom) and FBM (valueParm) channels, there are several ways to do it. In Poser using the Hierarchy Editor you can select the channel you want to delete, then hit the Delete key on your keyboard. If you have a lot of channels to delete you will probably find it easier to edit the cr2, using a cr2 editor such as the free "CR2Builder". Again just select the channel(s) you want to delete and press the Delete key. Make sure you have a backup of the original cr2 before using any of these methods!