put them in a file  STD BCV  if they are split then you just need to cancel their relationship  symmir -f file.txt cancel -sid 123
I am trying to dissolve some DMX 4 metas, but it is failing with "The STD device can not be manipulated because it is BCV attached to one or more BCV devices."  The DGs have already been blown away.    I know there is a way to put the STD and BCVs into a file and run a symcli cmd to remove the STD-BCV relationship, but does anyone know the exact commands?
Remove Timefinder Relationships - DG