The multi-source process maps information from two source records to a single target header record, and (optionally) creates target child records from multiple source records. This is configured in the Advanced Options tab of SFM Designer. The configuration includes creation of two SFM transactions, and defining one of them as the sub-process of the other.

A standard SFM transaction with multi-source configuration is 'Create Preventive Maintenance Plan From Account'. This has Account as the primary source to map information to PM Plan. This invokes the sub-process 'Create Preventive Maintenance Plan From PM Template', to map information from the secondary source PM Template to the same target PM Plan. The sub-process is invoked in the background automatically on save.