Importing to Specific Mailing Lists

I am getting ready to import email subscribers on a new CC account for the first time. I see in the help documentation that on Step 3 I will designate lists and tags. However, I have an existing list with contacts who will belong on multiple lists and potentially have multiple tags. is there a way to designate lists, tags, and segments for that matter via a delimited field? What is the process for import when contacts may have any number of lists, tags, and segments they belong to (but aren't all the same)?