Extra customization job is not something included in the support policy. Customization job will need extra charge but due to my busy working schedule, I am not able to accept any extra customization job anymore.

So, what I could suggest is that, you can find a freelancer on Fiverr(https://www.fiverr.com/) and discuss your requirement with the freelancer. Type "ASP.NET" or “Kendo UI” to search for freelancer who experienced in doing this kind of project. Thank you.