It is possible to filter Multicolumn data in GW 5.0 using the MultiColumnFilter Glyph to achieve this, however from your explanation it sounds like you have Time Series data in a Multicolumn format, in this case I would recommend first converting the file to Time Series using the ASCII translate module and then you can easily extract the required 30 channels using the Extraction Glyph, to make this neater/quicker use a looping super glyph to set the extraction to and from limits. If you need any further information then please email me at
support@ncode.com