EBSCOhost Collection Manager (ECM) allows you to add titles to a DDA, even after it's been activated.
To add titles to an active DDA:
Search for titles to add to your DDA.
Click the Add to List/DDA link in the result list for the title you would like to add.
Select the Add to DDA button and then choose your active DDA from the drop-down list.
Select an Access Model or Loan Term and click the Add to DDA button at the bottom of the window.
The title is added to your active DDA and OCLC will deliver the MARC records for the added titles within the next few business days.