You can assign default masking rules to the target fields.
The
masking
task package contains files with the default masking rules. After you install the Secure Agent, you can view the default_rules.xml, fields.properties, and salesforce_default_values.properties files in the following location:
The default_rules.xml file contains the configured rule properties for each masking rule. The fields.properties file contains the default masking rules for all the fields in the objects. When you apply default masking rules to the common fields, the task picks the default rules from the default_rules.xml and fields.properties files.
The salesforce_default_values.properties file contains the default values for the target mandatory fields that are missing in the source.
You can edit these files to change default values or create rules for default assignment.