Deploying List Templates
List templates are saved at site collection level. That means the ProblemReport10 template is available to all sites in the site collection. Deploying a list template is very similar to deploying a site template. To deploy the template to another site collection:
Navigate to the top-level site in the source site collection.
Click Site Actions → Site Settings, and click "List templates" under the Galleries heading. (In MOSS, click Actions → Site Settings → Modify All Site Settings.) SharePoint displays the List Template Gallery.
Click the ProblemReport10 link in the gallery. SharePoint asks if you want to save the file.
Click Save to download the template. Be sure to store it in your Templates folder on your computer to stay organized.
Navigate to the site collection where you want to install the template and repeat step 1 to display the List Template Gallery for that site collection.
Click Upload on the gallery toolbar and upload the file you created in step 3. SharePoint copies the file into the List Template Gallery.
Lists that include Lookup columns will have problems when used in other site collections since the source list for the lookup won't exist in the new location. Avoid Lookup columns when creating lists for reuse as list templates. The exceptions to that rule are when the list template is reused within the current site or when the lookup is a site column and the template is reused within the current site collection.