Hi, @Draconna
Thank you for posting in Microsoft Q&A forum.
We can type a "%" in the value, then click next, we can select more than 1 computers at a time:
We can also use powershell to add multiple devices to a device collection at a time.
https://www.prajwaldesai.com/add-multiple-devices-to-sccm-collection-using-powershell/
(Please Note: Since the website is not hosted by Microsoft, just for your reference.)
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