What do portion markings identify in a document?

Portion markings are specific indicators placed within a classified document to identify the classification level of individual sections or portions, rather than the entire document. These markings help readers understand the handling instructions for specific content, allowing them to determine what level of access is required to view that information. This is especially important in documents where different sections may contain varying levels of sensitivity and therefore require distinct handling and safeguarding measures. This practice enhances the overall security and management of classified information by providing precise guidance on the classification associated with each part of the text.