local file sharing

we have windows server domain .our server doesnt have large amount of disk space to make it as file sharing . so I want to make users to share files on their machines but also I want to protect these files to be accessible only by specific group like (accounting group) is that possible from domain controller.

the other problem is when i share a folder from my pc then add the link of this folder in the other PCs when my IP changed they lose the connection to this folder and I have to add it again is there a way to resolve that without make static IP.