Just to confirm that I have successfully edited a stoke file and been able to import it into the GOB file.
Step-by-step instructions:
1. Extract the GOB using BIG GUI program.
2. Find and export the BIG file which contains the stroke files (saf's)
3. Extract the BIG file.
4. Find and export the shots you want to edit.
5. Edit the shots.
6. Import the stoke files you edited back into the BIG file you exported in step 2.
7. Import the BIG file back into the GOB.
8. COMPRESS the BIG file.
9. FINISHED
There you go, sounds more tricky than it really is.