At present ‘custom download’ is available for a particular timeframe. If possible ‘custom download’ option can be added for selected entries (e.g. list of entries identified after a search by the word ‘Apple’; list of entries based upon responses entered in a column [all entries with the word ‘Apple’ in the column ‘Company’).
PS: I do agree that we can easily delete the unwanted entries from the downloaded csv file manually. However, if adding the ‘custom download’ option to the server is not cumbersome, it may be provided.