A feature has been added called LIST MERGING. There is a new menu on Lists page. To access click the 'LISTS' and under the LIST Actions, hit the 'MERGE LIST' button.
Clicking the 'MERGE LIST' button shows you the entire list. Select the lists you want to merge by putting a check mark in the box and hit 'Merge' to continue.
Enter a descriptive name of your new merge list, in this example it is named Merge Lists, then hit 'START'
'List Merging has started' pops up, merging process goes in a background, and if lists are big it will take some time to merge. During this time new list will have the "updating" status.
Clicking the 'MERGE LIST' button shows you the entire list. Select the lists you want to merge by putting a check mark in the box and hit 'Merge' to continue.
Enter a descriptive name of your new merge list, in this example it is named Merge Lists, then hit 'START'
'List Merging has started' pops up, merging process goes in a background, and if lists are big it will take some time to merge. During this time new list will have the "updating" status.