Create the OFC_Child Object Option record related to the OFC_Template record. The OFC_Child Object Option record stores various option settings for the child record output.
Create OFC_Child Object Option Record
Click the "Child Object Options" tab on the OFC_Template record screen and click the "New" button in the OFC_Child Object Options related list.
Information
Name: Enter any name, such as a child object name. e.g. Opportunity Product
OFC_Template: The OFC_Template record of the parent record is automatically set.
Child Relationship Name: Enter the target child relationship name. e.g. OpportunityLineItems
For details on each child record option, refer to Output Options.
Note
Up to 30 OFC_Child Object Option records can be created for one OFC_Template record.
Reference

