Hopefully this answers your question..
http://wiki.nubuilder.com/tiki-index.ph ... structure=
Steven*** The way nuBuilder uses hash variables is by replacing all valid hash variables with their values before the cusom code or SQL statement is run.
This means that these values end up being hard coded and won't change throughout the code.
Which means that in the case of refering to fields in subform rows the only way to loop through changing row numbers is with $_POST variables.