How to create a developer account in my company's salesforce

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I have created a developer account in salesforce. But now I need to create some logic that uses some custom objects that someone create in the company’s salesforce.

Should I create a developer account in the company’s salesforce?

Or should I replicate everything to my developer account?

Or…?

And how do I do it or where can I salesforce training how to do it?

Note:
I need to use objects created in production environment

Sorry @kavyasahu.dm1

we do not offer Salesforce support itself. Have you tried to load Handsontable to a project that is held in Salesforce?