fm what i can tell, there is no 'relinking' option see below
from here
http://office.microsoft.com/training/training.aspx?AssetID=RC010916061033To publish the list you created with the new List command in Excel 2003, begin by clicking the list (it must be active on the worksheet), point to List on the Data menu, and then click Publish List.
The Publish List to SharePoint Site dialog box appears, and you would:
1. Type the URL of the server (your SharePoint site) in the Address box.
2. Select the Link to the new SharePoint list check box so that you can update the list with changes. If you don't choose to link the lists now, you won't be able to do it later on, and you won't be able to update.
3. Type a name for your list in the Name box.
4. Type a description in the Description box, which is optional, but useful, and then click the Next button.