Hmmm... Isn't the accompaniment actually determined BY the style, in real time? Maybe I just don't understand the question, but conceptually, I don't see how you could copy an accompaniment from one style to another.
Do create a Backup file before you do any further actions.
Also create a Save All file ( saves user data in an easier form ).
There is a bug in the 4X BKP file creation process which has yet to be resolved. It relates only to large file sizes and leads to corrupt data. Hence the Save All is an essential file to create on a regular basis.
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