I have created a custom record and custom form using scripting . Now i want to copy the record and want to copy the form to use in new record. How can i copy a custom record ? and where i found the form that created using scripting ?

you will need to share more detail about the form. Creating custom forms is not a supported option for scripting

Are you creating a new record or record instance, subtle difference. record.copy (creating a new instance) would inherit the form if the form you have used is set to "preferred".

create an SDF project, download the custom record object and all it's instances and then deploy it to another environment