To create a Mailing List using Existing OfficeReady 4.0 Mailing Lists as the source, click the New List button
at the top of the Mailing List Manager. Give your new Mailing List a name (required) and description (optional), and click Next to continue.
You will then be brought to the list of sources for your Mailing List:

Select Existing OfficeReady 4.0 Mailing Lists from the list, and click Next to continue. This will bring up a list of all of your previously saved OfficeReady 4.0 Platinum Mailing Lists:
Select one or more Mailing Lists to import into your new Mailing List in your Mail Merge, and click Next to continue. You will now see a list of the contacts in the Mailing List(s) you have selected to use as sources:

All contacts with a check box selected will be imported, and all contacts with a check box cleared will not be imported. To select all contacts in the list, select the Select All check box at the bottom left of the menu. To deselect all contacts, clear the Select All check box.
After you have selected all of the contacts you wish to import, click Next to continue.
You will then be asked if you would like to synchronize with the Parent List:
Click Yes to synchronize your new Mailing List with the source OfficeReady 4.0 Platinum Mailing List(s). When you do this, any changes made to the Parent List(s) will automatically be made to this Child List as well.
Click No to save your new Mailing List without synchronizing with the source Mailing List(s).
Your import is complete. You will now be returned to the Mailing List Manager, with your new Mailing List available for use.