Creating properties file

Hello Forum,
I figured out that there are properties files which refers to another properties files.
These differ from the usual ones in that they have an arrow at the top. In addition, when you move your mouse over them, a tooltip will prompt to you where locate the original file.

Also, the content of these files with an arrow simply contains a link to another file, e.g.:
../../../another-folder/another-file.properties
I attached screenshot from bitbucket because intellij in the properties files with an arrow shows only inserted content of the exact file where it refers to.

Can someone help me how to create the same files with arrow?