Hi, David.

If i understood, basically you need to combine data such as a Nested JSON, but you need to show two roots?

Please check out our detailed Documentation here that explains what kind of format you need to make Nested JSON with our plugin,

and also in regards to roots, we pointed this out :

The plugin allows you to choose what the “roots” for creating the table will be, 

but please note that you can only select one level within your JSON file to create a table.

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Another important note:
The root path that is chosen, needs to have the same object with the same keys and values as you can see for chosen path “root->results”. 

If values are not a string, then those values will be skipped by default. 

In this case from our Documentation,  keys “films”, “vehicles”, “starships”, and “species” have values as arrays (in some cases they can be objects) and they will not be shown.

 If you need to show data from those arrays as well, there is an option with a hook, which our developers have shown in the Documentation Page, just scroll to the section named :

"Use hooks to parse one more level deep in root path".

Let us know if that helps.

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And i just wanted to point out that you can try wpDataTables before purchasing

 on our sandbox Demo sites ( you can find links for the main plugin Demo,  

as well as add-on Demos, in my signature),

and there is a 15-day money-back guarantee period, 

so if you purchase the plugin, you can safely fully test it out, and if it doesn't fit your needs you can request and receive a refund in that period. ( same goes for all plugins and add-ons)

Let me know if you have any additional questions. 

Hello David.

We're sorry to disappoint you, but we do not provide support for hooks and filters.

It requires a certain level of programming skills and included support refers only to advice.

The hooks are to be added to functions.php file of the theme or the child theme. The code is similar to the one found on our documentation. The important thing is that the last argument (that informs you about the number of parameters) is 3, since in our code, 3 parameters are forwarded. You do need some programming knowledge for this. If you want to see in wpDataTables code where they are being used, it's in ../wp-content/plugins/wpdatatables/source/class.wdtnestedjson.php file, on line 276, where these filters are being called.

You don't need to change anything in the code, though, just add the code to functions.php and call the hook with that name (wpdatatables_get_one_level_deep_json_data_from_array_as_string).