TIC Blank Subtraction

I am using OpenLab v2.2 and I want to subtract a blank TIC from a sample TIC to see only the scanned peaks in the sample.  When using the "blank subtraction" feature in the Processing method, I get an error message saying "Blank subtraction not possible: MS signals are not supported" and the chromatogram does not change.  I don't just want to subtract the peak areas, I would like to subtract the visual chromatogram.  Is there a way to do this?

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