How to "Undo" an import

If you have done an import but want to "undo" it, one way is to create a custom filter to identify the records you have imported, then remove them,

For example, to undo an import you've done into the Address book...

Go to Address Book, then click Filters and add a Custom Filter using the "Created On" date, and an appropriate "time" range, as per the below

This should show just the recently imported records

Which you can then remove using the checkboxes on the left