Guy Acheson wrote:
How can I dissassociate the flight from the task so
that OLC will accept the flight?

OLC doesn't care about the declared task.

Are you submitting via the web, or using a program such a SeeYou or
StrePla?

On the web, you will just need to provide start and end times for the
soaring portion of your flight. With SeeYou (the program I use), just
be sure the flight properties indicate the correct beginning of
soaring.

Again, the declared task is completely ignored by OLC.

-Tom