Create Sandbox with copied over tickets when using Custom objects

Please give a quick overview of your product feature request or feedback and note who in your org is affected by this issue [ex. agents, admins, customers, etc.]. (2-3 sentences)

We want to use a sandbox with copied over ticket, this is currently not possible a when using Custom Objects (due to the dependencies), no notice or option to proceed copying tickets, the custom objects aren't copied anyway. This affects IT that isn't able to test an app or configuration in a non-production environment

What problem do you see this solving? (1-2 sentences) 

This is a crucial Enterprise function that is being blocked, I understand Custom Objects don’t work, but at least give us a workaround.

When was the last time you were affected by this lack of functionality, or specific tool? What happened? How often does this problem occur, and how does this impact your business? (3-4 sentences)

Continuously because there is no way around the issue atm.

Are you currently using a workaround to solve this problem? (If yes, please explain) (1-2 sentences)

NO

What would be your ideal solution to this problem? How would it work or function? (1-2 sentences)

When creating a sandbox with tickets, give a popup stating that the customer uses Custom Objects, due to architectural limitations, this cannot be included in the sandbox, give the customer the option to proceed and copy ticket without Custom objects (more of an acknowledgement/agreement). Or fix the initial issue