We are using the Harvard Spreadsheet Importer, so components are repeated when we upload an updated component list. We have to delete the entirety of the existing component list in ASpace before we can upload a new spreadsheet. There is currently no way to bulk delete components in ASpace. Deleting components one by one has become a tedious workflow.
This is much wanted functionality and we hope to be able to provide it in the coming year. Duplicate of ANW-561, so closing.