Attributes in Custom Data Classes and Custom Inventory

I have a question regarding Attributes in Custom Data Classes and Custom Inventory.  I need to create a Custom Inventory that will perform a recursive search under HKLM\Software\Test hive and grab all the information below it.

I can create a VBScript to grab it, but how do I setup the Attributes in the Custom Data Class when there is a chance some computers might have 10 Keys or more under HKLM\Software\Test and under each Key there might be different number of Strings?  I use Custom Inventory today but I have never performed a recursive search and written to the database.