NiceLabel SE is the most basic application in the NiceLabel product range. You received it to start designing barcode labels for your printer, using all your existing designs and make labeling more efficient.
If you only need to design a few labels, NiceLabel SE will be enough to get started. If you have many products, you could end up with hundreds of label files. A better approach is to store label data in an Excel spreadsheet and use one universal template for all labels.