So this week, DraftKings added a new feature to their lineup management capabilities. If you go to your My Lineups section, you will now see a new button labeled "Upload Lineups". See Figure 1 below:
Figure 1: The Upload Lineups Button (Upper Right)
After you click that button, you get to choose the sport and the slate of games from this menu:
Figure 2: Sport and Slate Selection
Finally, the spreadsheet template is downloaded. Just open it up (See Figure 3) and fill out your lineups, then save it. Once you have it all filled out, the "Upload CSV" file button will be in play from Figure 2.
Figure 3: Creating a CSV list of lineups