go into "Workspace default" folder or a folder of a current Workspace
go into the last folder containing .afm aird and .capella files
package that last folder into .zip
you have now exported project
open capella.exe
after opening:
File > Open Projects from FIle System > Archive
then uncheck any listed folder which does not contain "Eclipse project" in Import as category
now you have a file tree on the left
then open file *.aird from the file tree, you have all nested schemes as you should