From the help dialogue for 8.5
Unlink Clips dialogue
When you right-click a selected group of two or more linked clips and choose Unlink from the pop-up menu, the Unlink Clips dialogue box appears.
This command lets you specify when unlinking selected linked clips whether to form a new, different linked group or to make the clips completely independent.
Hope that helps I did a search for linked in the search option for help, then selected the Unlink Clips Dialogue