Once an environment is associated with a search project, you can remove it from that project and associate it with a different project.
To move an environment:
On the Projects tab, go to Projects > Your Project > Environments.
Click the remove icon () for the environment you want to remove.
In the dialog box, select Detach Environment.
Click OK.
On the Projects tab, go to Projects > Project > Environments.
Click Add Environment.
Select Add an Existing, Unassociated Environment.
Select the unattached environment’s name.
Click Add.