Newbie question about making modifications to blocks of entries
I feel like this is a super newbie question, but how can I make modifications to groups of entries. Suppose that I imported 1000 entries from excel and now I would like to select blocks of them and apply a single drop down list entry to or maybe paste a single field into many in the same column. How can I do this? Also, is there a way that I can arbitrarily pick groups of entries and delete them at once without having to figure out an arbitrary search function that would select them all?
Thanks a lot for your help!