An override is where you create your own routine and place it in a specific folder for CSVI to use. This way you can add or modify the behavior of CSVI when importing or exporting to suit your own needs. The override system allows for great flexibility so you can write your own import/export routines and not having to worry that by updating CSVI your changes are lost.
The default location for import routines is administrator/components/com_csvi/models/<component>/import and for export routines administrator/components/com_csvi/models/<component>/export
The problem with having your modification in the CSVI folder is, when you update CSVI your modification is lost. Instead of putting your modification directly in the CSVI folder you can put it in your template folder.
The import routine overrides are located in the folder:
The export routine overrides are located in the folder:
The default administrator template in Joomla is khepri, so the location of the import routines for VirtueMart becomes:
The default administrator template in Joomla is khepri, so the location of the export routines for VirtueMart becomes:
To use the override feature take the following steps:
You can follow the same steps for export by changing the folder import to export.