Delete fileds for certain reference type in the bibtex output using Better BibTex postscript
I want to delete specific field for certain reference type using Better BibTex postscript. I read the script manual (https://retorque.re/zotero-better-bibtex/scripting/) in the Better BibTex, but I can only find "this.add" function, how can I delete specific field?
2. In better bibtex, the newspaper article is exported as article in the bibtex. I need url for this, but not for journal article.
By the way, if I still want to custom BibTex using the Better bibtex postscript, how can I delete certain filed? which function?