Move some geometry from the Master partition to the new partition
Delete the new Partition, that has just had the geometry moved to it.
The result if the partition is deleted, but the geometry objects that were children of the partition no longer appear in the UI.
The only way to get them back it to re-assign the geo root. That works for simple solutions but if you had complex partitions it may cause some lost work.
In Shifter's FBX Exporter,
The only way to get them back it to re-assign the geo root. That works for simple solutions but if you had complex partitions it may cause some lost work.