Well, actually both is possible:
There are the options “Update - From Client” and “Update - To Client” available!
This is from the SDK’s help:
You have the option to either import objects from or export objects to a Navision client using the Update functions under the File, Update menu in the menu bar. The Update From Navision Client feature allows you to update your Navision Developer’s toolkit database with objects from the Navision application database, and the Update To Navision Client feature allows you to export one or more objects from Navision Developer’s Toolkit directly to a Navision Client.
Both the Update To and Update From Navision Client features are also available from the right-click menu in the Object Administrator.
To import or export one object at a time to a Navision Client, first select an object in the Object Administrator. Right-click on the object and select either Update From Navision Client or Update To Navision Client. The Select Navision Client window will appear listing the Navision clients and companies that are currently open on your desktop. Select the Navision client you wish to use and click OK. A window will then appear containing information about the selected object. Click Update, and the object will then be imported from or exported to the Navision client.
You can also import or export several objects at once. To do this, select File, Update, and select either From Navision Client or To Navision Client from the menu bar. The Select Navision Client window will appear in which you can select the Navision client (the appropriate client and company must be open). Click OK to confirm the selection. A window will then appear in which you can specify the following information to filter the list of objects to the ones you want to import or export:
Object Type Select the type of object from the list: Table, Form, Report, Dataport, or Codeunit
Object ID Enter the ID of an object to be imported or exported.
Date Enter the date that appears in the Object Properties of objects to be imported or exported.
Time Enter the time that appears in the Object Properties of the objects to be imported or exported.
Version List Enter the Version List that appears in the Object Properties of the objects to be imported or exported.
Modified Enter Yes to specify objects that have been modified or No to specify objects that have not been modified.
Click Update to confirm, and the appropriate objects will be imported from or exported to the Navision Client. These two methods of updating use a checksum to determine whether or not an object has been changed, and only the changed objects are imported or exported. Objects that do not exist in the database will be created.
You can also use the Export Worksheet to export objects to a Navision client.
You can read more about how the checksum is used and about the direct access to objects in an application database through a Navision client under Using a Navision Client Instance.