Final answer:
Choosing an existing Import Set table for data loading into ServiceNow involves mapping and transforming data according to predefined schemas, ensuring accurate updates or creation of records based on the imported data.
Step-by-step explanation:
When an existing Import Set table is chosen to load data into ServiceNow, it involves the process of transferring data from various data sources into the ServiceNow platform. By using an existing Import Set table, you are mapping and transforming data according to predefined schemas, which facilitates the updating or creation of records in your ServiceNow instance based on the imported data. It is crucial to ensure that your data maps correctly to the existing table structure, and the transformation rules and scripts are properly configured to meet the specific needs of the data you are importing.