How to setup new company in a new database

As a start you need to restore database default,
you can find it in Navision installation cd, number 2.

Here are the steps that I usually do when creating new empty database :

1. Create New Database
2. Click Tools >> Restore
3. Find standard Nav 4.0 database backup, dialog box appear
4. Do not choose any company, check "data common to all compannies",
check "application objects"
5. Click Ok, restore all application object and common data, but no company
6. Create new company

or

1. Using the Navision client, open the standard database that was sourced
from the Product CD.
2. Create a new company and provide a name for the company. The new company
will then be created and initialized.
3. Switch to the standard company of the database.
4. Delete the standard company which will leave the newly created company
behind.
5. Open the new company and you will notice the same result.


Source:
New to NAV - Missing Menu and tables
www.mail-archive.com/navision-knowledge-village@yahoogroups.com/msg01703.html