Copy custom object fields on Incident standard copy

Summary

Copy parent custom object data on Incident Copy from ribbon

Content

Hi,

We are using parent custom object fields on Incident workspace as Incident fields as we have exceeded the maximum number of custom fields on Incident. 

But, when we use the standard copy function from ribbon, it only copies the incident details but not the parent custom object details. How to achieve this?

Any suggestions highly appreciated.

Thanks,
Geetha