If you want to use data from an existing code to fill out the fields to create a new code, this can be done using the Clone feature. This was created to save users time when creating codes with similar information.
You must have access to the original code. You can access the code from a group, dashboard or search results. From any of these areas, you can click on the code, then select Clone under Code Actions in the right side bar. From the group or dashboard, you can also check the box to the left of the code, select the Actions menu in the Codes table and choose Clone. This will bring you to the code creation screen with all of the data filled out based on the code being cloned.
See Clone a Code for more detailed instructions.