Secure section?

Good Day!

Could someone point me toward a method by which I can secure a Category (for example “Office Administration”) in wordpress?

I see where I can password protect a Page – but I need to make posts to a specific Category secure as well.

I thought about making a password protected page, and then making all other category queries (on the rest of the site) ignore the “Office Administration” Category – except where I wanted it to show.

But seems like a lot of extra doing and figured someone else may have come up with a better way,

Anyone got a suggestion?