From the lists, select the access group and SCID (service component ID) you want to work with.
From the list, select the configuration.
To enable a second production slot for a SCID:
From an open configuration, click Promote.
Click the Production radio button.
Click OK. (Remember, once you enable a second production slot for a SCID, you cannot return to having only one production slot.)
Click OK again.
Media portal creates the second production slot for the SCID.
Type the percentage of traffic you want to allocate to the configuration in slot B.
Add any notes that will help you or others keep track of the configuration.
Media portal promotes the configuration to the second production slot (slot B) and allocates traffic to the configuration based on the percentage you specified. The configuration appears in Transient status while Media portal propagates the change across the Lumen CDN.