Hello,
We have gone through this and we can provide you with the codes only for Multiple Combination Filters but not the Product Number Update as this will require a lot of Custom JS Codes.
We are happy to refund your Support Extension if you would not like to go through with this as these types of Customizations require more development time and testing. Also, ideally, Support Extensions are only for Support Requests related to Codes included with Canvas and not extending the functionality or features of a specific component. We can provide you with a Custom Quote on this if you would still require the codes for the full customization but the charges will be hourly. 2 Hours ($39 per hour) for a Total of $78.
We apologize for any confusion with this and as we have mentioned, we are very happy to refund your Support Extension, which you can request here: https://themeforest.net/refund_requests/new . Meanwhile, we will definitely include this feature suggestion in our Updates List and release this in the near future which you can use for Free as Updates are included Free for Life.
Thanks for Understanding.
Meanwhile, do let us know if we can help you with anything else or if you find any further issues with Canvas.