It would be helpful to have additional context (whether this is a civil or criminal matter, etc.) But it appears that in your text “Juzgado” = trial court, while “Sala” = appellate court.

You will have to work all of that into this pithy legal Spanish formula and perhaps fix it if you prefer E&W terminology, but what I believe your text indicates is that the Procurador is filing the appeal at the trial court (“Juzgado”) that rendered the decision being appealed, to subsequently be transferred to the proper appellate court (“Sala”). In certain Spanish appellate procedure an appeal is actually filed at the lower court that issued the decision to be appealed (“juzgado” or “tribunal a quo”) where it is examined to verify that it meets all filing requirements (whether the decision is actually appealable, whether it was filed on time, etc.). If it does, the record on appeal ("las actuaciones", "los autos") is then transferred to the appellate court (“tribunal ad quem”) that will actually hear the appeal ("remisión de los autos del tribunal a quo al tribunal ad quem".