How to add new source file to Segger for nRF9160

[CWallach]

Using SEGGER Embedded Studio for ARM v4.20a (64-bit).

I'd like to add a new source file to a nRF9160 sample project. The menu selection Project --> Add New File is grayed out.  Also grayed out is  Project --> Add Existing File.  Right clicking on the project items window offers no options for adding a file.  I tried editing the XML in file build.emProject but it was ignored. 

Thanks

[sread]

One way to do this is to open CMakeLists.txt in the sample project root and add a new line, ie.

target_sources(app PRIVATE src/your_new_file.c)

When you reload the project in SES the new file will be shown under app/libapp.a.