AGS call to update the CYCLE and/or BIL field in BR42

Hi everyone,

I am not having much luck with creating an AGS URL (query) to change the cycle and/or the bill fields in BR42 on a specific activity. Has anyone done things like this with BR42 before? I've made other AGS calls but nothing with multiple lines like BR42 and wanted to how if there is a trick. Thanks in advance.

-Trever Kresge