HI I'm using AEM 6.3 Editable templates.
I have created a custom Template A.
Site1,Site2,Site3,Site4 are built using Template A and I have header title component on each site which should be unique per site, PFB screenshots for the reference.
we need help to build this title component dynamic for multiple websites, so that the title is dynamically picking from the title of the root page.
You could use context aware configuration to define the title once and then render it in all pages ( only required if the structure differs between projects).
Apache Sling :: Apache Sling Context-Aware Configuration