How do i set a blueprint to be a child of another blueprint?

I have three enemy blueprints and I need to child them all to one blueprint class so that a turret can fire at them. How do I do this without using C++?

I want to child the enemyBBT, GBT and PBT to the enemyClass blueprint.

Cheers!

Go inside your child blueprints. From the top right menu choose File>>Reparent blueprint and reparent them all to your enemyClass.