steps to understand the question:
1. have an object type with certain data
2. Need to update the data
3. export the current csv file of the object type
4. Make changes to the csv file. Add new information/rows and delete some existing rows.
5. When importing how to import so that all the updates are captured? (new rows added and some old rows deleted)
6. When I follow these steps everything is done properly but can not remove old data from the object type.
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