Sorting references into groups based on Word list

I have a list of about 700 references in Word, and I need to search for each one within a single EndNote library to sort it into one of 15 groups. If anyone knows a relatively painless way to do this, help would be greatly appreciated. Otherwise Ctrl+F for each one seems to be the only option. A few references (55) fall into more than one group, but I guess sorting those could be done manually if there’s no other way. Thanks for any help.

Not sure exactly what you are asking for. 

Have you explored setting up smart groups to search and automatically sort the records into the various groups?