True/False: You can create a new template by editing an existing one in AEM.

Creating a new template by editing an existing one in Adobe Experience Manager (AEM) is indeed possible, hence the answer is true. This ability allows users to leverage existing templates that may already contain useful structures or functionalities, making it easier to design new templates that meet specific needs without starting from absolutely nothing.

When you edit an existing template, you can modify various components, layouts, and configurations to reflect the desired design or functionality for the new template. This is particularly useful in organizations where consistency across templates is important, as it allows for the easy adaptation of established designs.

The other statements reflect limitations that do not apply to the functionality of AEM's templates. AEM's flexibility in template creation is a fundamental feature that encourages efficiency in managing digital assets and content.