Enables Jira administrators to configure for which projects subcomponent picker will be enabled. Component Attributes: This add-on allows associating various attributes to components. You can think of it as custom fields for components. You decide on what kind of attributes you will have and component leads may specify values of these attributes for each components. You can use JQL to query component attributes.
You can specify attributes values of each component on "Component Versions" page and you can use JQL to query component attributes.