Sorry for being Sirsi-specific here, but I'm reckoning one of you has seen the API docs and knows the answer to this.
I understand how to replace or change tags with editmarc / editrawmarc / updsubfield. But what I can't seem to figure out is to how to add a tag (in this case, a local heading) that doesn't already exist. My only thought has been to export the record, muck it up in perl and then overlay it but... that's a terrible way to do things.
My input is a list of catalog keys (or barcodes).
I'm hoping someone has a more straightforward method?