Copy in
Definition 1 of 1
Pro Tip 1/3Email Inclusivity
Use 'copy in' to include someone in an email thread for information or updates they need. 
I'll copy you in so you have the project details.
Pro Tip 2/3Keep Informed
'Copy in' suggests that the recipient is being kept in the loop, but not necessarily expected to respond. 
Let's copy in the manager, so she's aware of our progress.
Pro Tip 3/3Transparency
Using 'copy in' can show transparency in communication among team members or departments. 
I'm copying in all team leads for full transparency on this issue.