Ability to edit disk section & location of socket, pid

[0xlne]

1: Once a VM has been created, I can't seem to be able to edit the location of the disk with "e" - that field is not present.
Neither can I use the ISO/IMG fields, as these seem to be treated as the external/removable storage for installation?
It would be nice to be able to specify the location of an image file (qcow2 or img) directly during the creation of a VM, without the need to import a disk image.
The dialog opened with "I" forces to define a disk anyway - not possible to create an empty template without a disk or specify an img file that is already a "system" disk which doesn't need importing.
If on the other hand this is possible, I'd be grateful for guidance.