>>1. Can I download styles from G800 or >>G1000 and load to my G-600?
You can load all the styles from g800.
(From g1000 you can load only styles which are created only with tones from bank C, D (g800/600), and E, F (E86)).
>2. I got error message: Internal Memmory >is Full, Delete unused Style!
>What is the quickest way to freeup memory?
You need to delete some styles from position 1 - 8. (you can delete some not useful parts, some intros or ending to release style memory).