Change Scene From Color To Black and White Back To Color

Hello, I am looking for ways to make my scene have a certain part black and white, then change back to color. How can I animate this? Thank you in advance!

Sounds like you need to use compositor nodes to isolate a region of color using a key effect. Take the result and desaturate it with a Hue Saturation Value node then use the alpha of the key to add the black and white back over the original shot. Mix in and out as required.