If you select a morph channel to be copied, Poser will automatically copy the dependent morph channels also and over-write any existing channels with the same name, unless you de-select them. This overwriting is not a problem of course as long as the over-writing information is the same as the original, but with the morph brush as powerful tool to edit morphs, chances are information is not the same. Maybe this is why functions are 'Pro' only. Functions may collide and users are expected to know what they are doing. Catching such incompatibilities would make both tools clumsy.