At my new job we have to keep issues in another location until we port those projects into Jira. In this spreadsheet there will be items that do and do not exist. I have to keep these 2 locations in sync.
If I can export from JIRA with the auto assigned ID's (TO-33,TO-55 etc) in the export I can sync much easier but I'm not sure what the actual name is for this ID and if this is possible. I would certainly think it should be!