If you’re looking for a .DAT file for mame4all that allows you to merge parents and clones I’ve used this one:
http://www.progettosnaps.net/dats/MAME/MAME_Dats_037-52.rar

Choose the .037b5 .DAT file, then when rebuilding with clrmamepro choose merged sets instead of split or non-merged. It cut my list of 2200 ROMs to a little over 1000