In which scenario would you typically need to use Delta Reimport when working with tags?

Delta Reimport is primarily utilized when modifying existing tags within a historian system like AVEVA Historian. This process allows users to update specific attributes or configurations of tags without needing to re-import all the tag data from scratch. By using Delta Reimport, changes can be applied efficiently, ensuring that only the modified tags are affected.

In this scenario, modifying existing tags involves adjustments to parameters such as name, data type, or data sources. Delta Reimport specifically ensures that these updates are implemented while preserving the historical data and configurations related to other tags.

The other options do not align with the intended use of Delta Reimport. When deleting tags, the typical process is to remove them directly from the system without the need for reimport. Importing all tags anew would not require Delta Reimport, as it involves a complete refresh of the data. Creating new tags is typically accomplished through standard import procedures rather than Delta Reimport, which is tailored for updates to existing tags.