I use the software to arrange everything as it should, so I can play games

Basically I have a 0.161 dump for mame, and it is all right; but I have a ton of games, and honestly, I do not see a reason for keeping the clones.
While checking Romcenter, I see that there is a function to delete a file; but sadly it does not work when you select the files in the datafile; it works only in the rom files tree. This has the negative effect of not allowing me to delete all the roms selected as clone.
I have rom merge mode as "un-merged"; and bios merge mode as "un-merged"; so I have one file with all the roms for each game and clones (from what I understand; please tell me if this is incorrect).
I tought that this may help to get rid of all the clones, but then I found that RomCenter won't keep a record between the game name and the file name (if there is a way, please let me know how to show this info...I see the rom names but not the file name for that rom).
If I knew which file is associated to each clone, I could do the work by hand; which is not ideal but better than nothing.
I saw someone mentioning to use the option to include all the roms in one archive for each game, but this would mean to have a ton of roms in the main archive for the main game and clones, while I would like to get rid of clones.
Also I heard about create a new dat file from the origilnal list, which I could use to then copy all the original roms in a different dir and delete the rest, but I have no idea how to do that.
Also is this feature still under work? I found posts on this forum that are ancient; and they were also requesting a way to remove clones, and the 4.X beta does not seem to have this function either.
Can anyone suggest a way to do so, with some step by step instructions? That would be kindly appreciated.