It looks like you're new here. If you want to get involved, click one of these buttons!
How do you merge games (where there's multiple discs or .bin and .cue files for the discs)
For mixed sets Options > ROM scanning > Merge game sets
For single system sets Menu > View > Merged sets
This assumes tou have purchased this feature (or you have chosen this as one of your free features, or are in the trial period) and that the files are matched to the same game.