A Nevada criminal case lives in the court that heard it. Felonies are district court cases, and most of them start in a justice court with the preliminary hearing, so a felony often has two case numbers in two courts. Misdemeanors are justice court cases outside city limits and municipal court cases inside them. The court records page on this site explains the structure; this section is about finding the criminal file.
Clark County, which is Las Vegas and most of the state's population, files felonies in the Eighth Judicial District Court. The court's portal "is available to provide the status of cases and case filings in the 8th Judicial District Court," and warns that "sealed cases and certain information that is exempt from disclosure will NOT appear on the Portal." Its case and calendar inquiry page offers a "Civil, Criminal, Family, and Probate Case Search" by name, and the clerk's records page notes that the clerk "maintains court records from September 1909 through the present date," with older files requested by form and copies certified for $5 or exemplified for $9 when you supply the copy. Las Vegas misdemeanors are in the Las Vegas Justice Court's own search, and the city's municipal court portal covers city ordinance and traffic cases; Henderson, North Las Vegas and the other townships each run their own justice court search, and the justice courts charge for clerk searches by the year, one dollar per year searched per name at North Las Vegas.
Washoe County, which is Reno, files in the Second Judicial District Court, whose case and calendar inquiry lets anyone "search court cases and view available case information." The other nine judicial districts, covering the fifteen rural counties, are listed in the judiciary's district court directory and justice court directory, and several of them search only at the counter.
Every one of these is a name search. A Nevada court index does not confirm that the person in the file is the person you are asking about, and a common name in Clark County returns other people's cases. How a professional pins a record to the right person is explained on the criminal records page, and it applies here exactly.