http://www.mythicmobs.net/manual/doku.php/databases/drops/overview
You can achieve functional parity by taking the % chance you want the table to have and cutting that per item in the table, but then you have to update all those numbers every single time you change the items in the table, and you have to further adjust for ratio balancing etc.
It would be way more effective to...
Allow amounts/chances for internal drop tables
It would be way more effective to...
Allow amounts/chances for internal drop tables