While the WinTEQC editor seems to offer the capability to exclude individual SVs judging my the sample screen at: http://teqc.silkwerks.com.
I believe this button is intended to exclude a type SV (e.g. GPS or GLONASS) and NOT individual satellites. I base this statement on the teqc tutorial document here: https://www.unavco.org/software/data-processing/teqc/tutorial/tutorial.html. As well as my view that such an action would violate the integrity of the file.
The selective deletion of GPS satellites should be done during data processing with the observation file intact for future analysis and perhaps reprocessing with better code or models.
I do NOT see reference to deleting individual SVs; if you find it please advise. I cannot find any documentation for the WinTEQC software.
I copy below the sample interface data on the silkwerks site. I highlighted the comments which could be interpreted to support my view (or not).