In List Builder Solution No. 211, I read that I can "Importing lists into List Builder", I am doing this because I want to add an activity to only about 75% of my customers. I have exported the customer list to excel, sorted out the customers I do not want, imported the list into the List Builder table, but when I go to add an activity, my updated List Builder table is not there.
I want to do more mass emailing and mass activites and am having a heck of a time with List Builder.