The solution can be (and usually is) also modified according to your requirements.
The module has its own independent administration interface where you can manage what supplier categories will be imported to your store and where, you can also set price margins for each category consisting of grouped products.
The import module works only with this supplier. If you want to add another it is necessary to add the adapter by our team. You can add your own product manually without any conflict with the import module.
In case you are interested in the solution, please let me know and we can start. It usually takes 2-6 days to finish the integration process.