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To add a subobject custom defined field (CDF):
#From In the '''Customisation''' menu, select → '''Data Inventory Manager'''.
#From the left pane of the Data Inventory Manager window, select a subobject table.
#Expand the subobject table and select the data category to which you want to add a subobject CDF. If there is no data category under the specific subobject table select Uncategorised.