I'm not sure what you mean.  If you save your content in a pre-linked runtime, it will have that content in it, just like if you install new content, just like Poser.  If you want to search for content, it will auto scan, but if you want to manually add content (The Add button on the left hand side of the Preferences dialog, under the Directories tab), you have to select one item at a time.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.