The script utility shown in this knowledge base article is intended to serve as a “user tool”, whereby multiple spectra can be multiplied together over a wavelength range and form a unique resultant spectrum. This knowledge base article also discusses how to add user-tools to your toolbar.
Download the article PDF: Combining Spectra
Download the FRED script: spectrumCombiner.frs
Download the FRED file: spectrumCombiner.frd