Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 138)

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Linked and Unlinked Grades in Multiple Sessions
By default, any clips that refer to the same file in the Media Pool are linked and share the same
remote versions of grades that are applied to them. For example, two clips that are close-ups
from the same take refer to the same media file, so they’re both automatically linked to one
another and share the same remote grades.
This is also true for clips that appear in multiple sessions. Clips that are located in different
sessions, but that refer to the same file in the media pool, are linked and share the same
remote versions of grades. This is why you can grade one session, and then import a reedited
version via EDL, AAF, or XML, and have the new session automatically inherit all of the grades
from the previous session.
However, you can override this behavior to have one session that’s independently graded
from the others. Simply select that session, open the Color page, right-click any clip in the
Thumbnail timeline, and choose Batch Copy from the contextual menu. All grades are copied
to Local Versions, and from that point on all changes you make to grades in that session have
no effect on the other sessions in your project.
For more information about Local and Remote sections, see the Color chapter.