Vonnegut37, I go to collection summary. Click on Add/Update. When the set loads, I go to the number I want to add, click on drop down menu, then click on "add muliple" . Under "quick add" you see the drop down menu for the collection you want to add to, the block for quantity, and the "add" button. If you want to add 16, put 8 in the quantity box and hit the add button twice quickly, instead of once. You have to make sure you do individual, firm, quick mouse clicks. You can't just hold the button down,must be distinctive clicks. I've added 50 this way, beats loading 10, five times. Hope that helps.