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Hi, Hope someone can help

I know about setting the pre-render value to 0% when you are using load only mode for shared GI in a render sequence, but are there any other settings in the FG tab which will stop additional FG data being calculated, so only previously saved GI data is used?

Thanks

No there is no such option in OB2 except turning prerender to 0% and fg rays min/max 0.
There will be an option to turn off calculation of new FG completely in OB3.