This is a time saving tip for application designer. If you are creating a new record definition and you want all or most of the fields from an existing record, you can simply open the existing record, select the fields you want and drag them over to your new record as shown in the screenshot below.
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Hold the SHIFT key and click on the first and last fields to select a group. Hold the CTRL key and click to select or deselect individual fields.
If you attempt this in an environment with change control locking, this trick will not work if the source record you are copying the fields from is not locked by you. So you will need to first lock the source record (if appropriate) before copying the fields over.