Zotero 5_Win10_How to separate one library in two parts ?

I have been working with Zotero for 3 years. I store all web pages (with or without PDF) in one library. The size of my backup is about 80 MB. I created different collections in the Zotero interface to organize web pages. I would like to share (with synchronization) a part of my library (so some collections) with colleagues. What procedure should I follow to have separate my library in two parts ?
Thanks for your recommendations.
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