Ok, maybe this is easy, I don't know.

We have a public folder "Firm Contacts" where all of our contacts are
stored.
Each user has a "Contacts" folder in their mailbox.
I would like "Firm Contacts" to show up underneath the Contacts folder.

I can drag and drop it in my mailbox, but then it seems to copy the
entire public folder over, which is not what I want. I just want a
shortcut underneath Contacts that points to Firm Contacts, and I want
all users to have this.

Is this possible?