As of now, you can tag vendors for the 1099 or 1096 status by various options in Core such as a memo, note, groups or custom field. One option is to create a vendor group and assign all the 1099 vendors to that group. Then you can run reports based on that vendor group. You can also run the MISC 1099 report by that vendor group. In addition, on the Vendors > Date & Hours screen, you can tag the relevant vendor for 1099 payments.