How to use rc.local.s10.mhonarc ?

All, I am trying to use rc.local.s10.mhonarc from http://www.ha-schneider.de/software/smartlist/ to set up an archive for a mailing list. I have renamed rc.local.s10.mhonarc to rc.local.s30 and added following line to rc.custom RC_LOCAL_SUBMIT_30 = rc.local.s30 rc.local.s10 and rc.local.s20 are already in use and since I do not know how to merge the recipe in rc.local.s10.mhonarc with either of the two, I renamed it to rc.local.s30 and added a new line in rc.custom. Could someone please help me understand as to how it all works. Thanks Nishi