Cmake superproject with several subprojects

I would like to create a Cmake superproject which call several subprojects.

To do that, I add the following command in my cmake superproject:

add_subdirectory(source_dir binary_dir) where:

source_dir=/absolute/path/to/my/subproject

binary_dir=subproject_name

In this case, I have several issues:

1 - The source file of the subprojects don't appear in the project manager tree

2 - If my superproject contains only 1 subproject, the superproject works well. The table of couples (Key, Value) in cmake compiler parameters contains parameters of this subproject. I can build the whole superproject.

3 - If my superproject contains several subprojects,  I have several issues in this case. The table of couples (Key, Value) in cmake compiler parameters contains only parameters of the first subproject. Therefore, the second subproject don't build.