Dear there,
We are Magento experts having 100% success ration for all our projects.
I believe, we need to add multi store/website support for your custom extension. Can you please provide us FTP details and guideline about functionality of custom extension. So, we can look into code and modify it accordingly to make it work with Multi Store support.
Looking forward to work with you .
Kind Regards,
Taha
MoonRose Infotech