Yes, in STEL Order you can massively discontinue the products you want.
From your profile access Settings > Import/Export > Export to file > Type of information > Products. In the Available Attributes column you must select Reference and Name to move them to the Selected Attributes column.
In the Excel document, save only the products you are going to unlist, then access from Settings > Import/Export > Update from file > Type of information > Products and add the rest of the information. In Additional information > Discontinued, you must check the option Yes.
Now you just need to select the Excel file, assign the name to each column and click on Update.
.When performing an update you can upload files with a maximum of 1,000 lines, therefore, if you have a file with more lines you must split the Excel files.
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When discontinuing products you must take into account that when you enter the Catalog > Products list they will not be listed, in order to see the products you discontinued you must click on the top right the Filter > Discontinued button.