Health and Shield Attributes. How to add Armour to attributes

I'm having trouble finding where to add more attributes to the PC character. I'm trying to get my character to have health, armour and shield attributes (where armour starts depleting after the shields deplete)
 
If you want more than the health and shield attribute, you have to implement your own class inherited from Health or CharacterHealth. Just override the OnDamage method.
 
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