Xcode project inside project

They are called cross project references. From the link below:

Cross-project references are a convenient way to create relationships
between two separate Xcode projects.

One method of creating shared frameworks is using sub-projects. You can also do it with single projects. More here:

https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPFrameworks/Tasks/CreatingFrameworks.html

Other links:

Xcode 4 Adding a Sub Project

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