I don't really understand what you are trying to do, but one thing that popped to mind is that if your current system is current.gro you can do this:

genbox -cp empty_file_with_box_dimensions_I_want.gro -cs current.gro

Basically you are "solvating" an empty box with replicas of your system. If your system if larger than the box then only part of your system will be included in the output.

Probably you can trjconv -translate your current.gro and repeat genbox to get the output you desire (although I am not sure about that one).

I do this for example if I have some waters that are too close to the protein in an erroneous setup (or recently as output from an improperly completed make_hole mdrun of a collegue) then I strip out the waters into a seperate file of exactly the same size and then use then to resolvate via genbox.

Chris.

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