The Import Wizard (on step 7) doesn't allow anything but replacing or inserting data, why?
Apply OS: Windows, macOS, Linux
Apply Navicat Product: All
Apply Navicat Version No.: All
In order to activate the remaining options in this step in Import Wizard, you must enable Primary Key in the previous step. Navicat would need primary key in order to locate the record for deletion or update action.
This only applies to situation when you import your data into an existing table / collection.