My contact list is 250,000 contacts. I don't know how to quickly break it into multiple 40,000 contact lists. Please help.
I would say the best way to separate them would be to export your contacts list to a spreadsheet, then break them into several new spreadsheets with 40,000 contacts each. Then you can re-upload them one by one to a brand new list. After that, you can choose what to do with your pre-existing contact lists you still have in your account (if they are still relevant).