You can set the items that are in the dock on each user account by adding them in the Workgroup Manager.
On the server, open up Workgroup Manager.
You'll need to figure out if the previous admin has restricted access to items on a group level basis, or on a user level basis.
The most efficient way to apply these preferences is on a group level basis, so I'll post instructions here with that assumption.
Log into the workgroup manager directory and click on the groups button.
At the top of the screen, click the "Preferences" button.
Select the goup name on the left.
Click the Dock button.
Ensure that "Always" is checked.
You can add items to the dock here. The network folder that you want to add is in the lower of the two fields, under the Documents and Folders field.
I know it's a basic description but like any server system, the options you can set are pretty abundant.
I hope my description gives you a good place to start!
Thanks for this it has helped immensly.
One thing for anyone else reading this post with the same issue, I had to browse to the network share in the finder before I could then select it in workgroup manager.
My only concern is that the icon is a question mark until you click it, then it changes to the standard icon.
Now all i need to know is how to restrict the finder menus with workgroup manager so I will start a new post.