Final answer:
The tool used to determine relationships between fields in an import set and an existing table is called a Transform Map. This map helps users align import set fields with those in the existing table, providing a clear guide for data integration.
Step-by-step explanation:
The tool used to determine relationships between fields in an import set and an existing table is called a Transform Map. A Transform Map is a feature within data import tools, such as those found in enterprise service management software, which allows users to specify how fields in the import set correspond to fields in the existing table. This mapping ensures that data from the import set is correctly aligned with the existing table when it is imported. The Transform Map can include direct mappings, where fields are matched one-to-one, as well as more complex logic to handle cases where the data requires transformation or conditional processing before being integrated.