I think that we should start over on this one so that we are clear on the situation and the solution that will be needed.
If you are working with PowerStore you can setup your products to include options. When you add in the options for a product you can then go and update that product for that option choice by choosing the option value at the top of the update page. When you select the particular option for that item you can update the price of the item, this will only adjust the price for this item & option combo.
I think that this might fit your needs without any further customization. If you have tried it this way and did not get the proper result please let us know. If you are wanting to do something more than this then we can continue on that part.