You can replicate a parameter template you have created. When you have already created a parameter template and want to include most of the custom parameters and values from that template in a new parameter template, you can replicate that parameter template.
After a parameter template is replicated, it takes about 5 minutes before the new template is displayed.
Default parameter templates cannot be replicated, but you can create parameter templates based on the default ones.
Alternatively, click the target DB instance on the Instances page. On the Parameters page, click Export to generate a new parameter template for future use.
After the parameter template is replicated, a new template is generated in the list on the Parameter Template Management page.