Delete MObjects

You cannot directly delete MObjects. You can only mark them as deleted, so that deletion operation will be carried out on them during persistence.

Pricebook2 pb = [ ... ];
MObject mo = MObject.create(pb);
mo.markDeleted();

You can mark an MObject as cascading delete, and this will in turn mark all the children MObjects to be deleted.

Pricebook2 pb = [ ... ];
MObject mo = MObject.create(pb);
// All referencing opportunities will be marked as deleted
mo.markDeleted(true);