Exclude Collection (or items) from syncing

Is there a way to exclude a subset of a library from syncing?

Also, if the PDF files are just linked to on a local computer, are those links absolute or relative if the metadata is moved to another computer? In other words, if the PDF files are not synchronized with Zotero (or other) server, what's the best way of moving the files and the Zotero metadata from one computer to another?
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