How to add on to a character's rig?

I built a set of wings that go on the character. I created an animation for the character with the wings attached. The wings are a separate model (just an add-on to the regular character).

How can I add the wing-rig to the character so the animation can be played?

The best way to do so in my way is to use the Custom Character plugins, it make it wayyy easier to do so.

Here is the link: https://www.roblox.com/library/171922549/Character-Creator-BETA

You just have to unanchor your wing, i also give you the tip to unions the wings or meshpart it the most possible so it wont be long to bind them.