edit unformatted citations

Is there a way to edit citations in a Word document before they are formatted? For exmaple, to exclude the author, add page numbers to a reference, create a citation such as "AuthorA, date, page# in AuthorB, date, page#)? Going back and forth trying to make edits to each citation individually using the Endnote window is absurdly and unnecessarily slow… I’m losing my mind (and patience with the program).

Thanks for any suggestions! I’m sure this is do-able. But I am new to Endnote and can’t seem to figure it out.