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