In the Portal, browse to Settings > Manage ESI Systems.
Click Add Command Center (i.e., the green Plus icon).
Complete the form.
An icon corresponding to your newly attached Command Center displays in the Portal.
Detaching Command Centers from the Portal
At least one Command Center must be present in the Portal. The last Command Center cannot be deleted. To detach a Command Center from the Portal, follow this procedure:
On the Settings > Organizations page, select the organization you want to delete.