I run the GOG installer, then copy the game files to where the virtual C: is for my DOSBox-X (in a git-repo). Then there is usually some small BAT script to write to launch the game (what is required can be figured out from the config GOG installed). I play all the games from within DOSBox-X, so I start that up in fullscreen and then run games as if running real DOS (from COMMAND.COM prompt).
It is of course possible to launch games from outside of DOSBox the way GOG does it, using host OS (non DOS) launch scripts and config for each game, but I prefer to have more like a virtual DOS fantasy console with all games installed. It also means DOSBox is fully self-contained, with no dependencies on the host OS. Once set up there is no maintenance. There is no code rot in DOS of course, so when something has been set up it will always work.
It is of course possible to launch games from outside of DOSBox the way GOG does it, using host OS (non DOS) launch scripts and config for each game, but I prefer to have more like a virtual DOS fantasy console with all games installed. It also means DOSBox is fully self-contained, with no dependencies on the host OS. Once set up there is no maintenance. There is no code rot in DOS of course, so when something has been set up it will always work.