You can make make BP_TrainingDummy a child of BP_EnemyBase which is a child of AEnemyBase
But you can’t then also have a separate cpp parent class for BP_TrainingDummy like ATrainingDummy. As far as I know, blueprints doesn’t support multiple inheritance.
So, BP_TrainingDummy’s cpp parent will have to be AEnemyBase
*I don’t know if I explained this correctly 