Hi,
Being as how Soundforge is not just an editor, but a DAW it might not be possible, however, a friend suggested this:
"If you bounce and import into Wavelab or something with the intent to edit there and then bring back into S1, it might (not sure have to try it to see) not save from there if S1 has control of the file. You may have to save it there under a different name and then bring the new copy into S1." Easy enough with ALT+Replace though."