Exchange cutover migration

Hi,

Today I started the exchange cutover migration via Outlook Online. However I wanted to migrate first the mail of my IT department but the exchange cutover migration toke all the mailaddresses. 

I've now bought 11 licenses, so I want to migrate 11 mailboxes. I want to select the mailboxes that I want to migrate. Isn't this possible via exchange cutover migration? 

I hope this is possible, because I don't want to migrate mailboxes manually via .CSV. 

Thanks in advance,

Koray