Using computer as network switch

I have a desktop computer that has a wi-fi adapter in it so that it can be moved around on a cart.
I have an item that I want to use with it but it has only a wired network connection instead of wi-fi.
Is there a configuration or software that can be run on the computer so that the accessory can be connected to the computer's wired network port and share the data from the wi-fi?

I believe this is what Internet Connection Sharing is for, but I've never used it. Technically I believe it makes the computer act like a router rather than a switch. So it may not be ideally suited for what you're trying to do.

thank you