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What your are after are composite builds. And maybe you want to combine those with https://melix.github.io/includegit-gradle-plugin/latest/index.html

@Vampire Thanks for quick reply. Looks promising. Is there any other alternative instead of this plugin. Due to security concern in my org, we are limited to use unknown plugin.

You can also use the built-in source dependencies functionality. But it is experimental and not actively worked on. You can also use any other means to check out the projects together. No matter which of the three approaches you use, the combination of the projects is always done using composite build, either explicitly or implicitly underneath.