Yes, it's possible.
First though. Are you using manual targeting and manual ID?
If you are not, then you can click on the targeting notepad (top right) where is says (IIRC) SHIP (or similar) and it will take you directly to the correct entry page in the Recog Manual.
Otherwise, list the entries you want gone then navigate to their ship folder in the installation directory and move the TGA file that details the recog manual entry. You may have to edit a cfg file in there too.
Can't be anymore specific than that at the moment, I'm nowhere near my GWX files.
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