The proper way to do this is by interrogating the HTML table and using the designer to define the rows. You can then interrogate the check boxes on the first row. You must make sure that your match rules for each check box are loose enough to allow them to match on subsequent rows. Then you can iterate each row and refer to each check box via an index.
If you haven't already done so, please review the HTML table designer as that is what it is for. If this is not defined within a table, then you'd likely need to clone each row and adjust the hierarchy, which would likely require some hands on with our services team, as that could get pretty complicated.