Purge Activity Slips window—Step 3You can only purge an activity slip if the invoice on which it was billed has already been purged. Also, if you include activity slip hours on timesheets, you can only purge an activity slip if the timesheet on which it was included has already been purged.Click in this column to select the cards whose activity slips you want to purge. If you want to select or deselect all cards, click the checkmark button at the top of this column.This column contains all employee and vendor cards in the company file. If you want to purge a card's activity slips, click in the select column next to the card's name.This column displays the type of card (employee or vendor) for each card in the Card Name column.