Open Photo Tab on Itunes
By "Sync Photos From: (Select) Choose Folder
New page opens in Picture Library
Under "Organize" heading, scroll down and click on Pictures, a drop down menu opens.
Click on "My Pictures"
At the bottom you should see Folder: My Pictures
Go down and click on "Select Folder" this will take you back to Itunes
Check "Selected Folders" Once you do this, a drop down menu will appear listing all photo folders.
Check off all new folders you want to sync to your Ipad.
You MUST also check off the folder you already have on your Ipad; if you don't check it off, it will be removed from your Ipad and only the new selections wil appear on your Ipad.
Once all your selections have been made, click on Sync and your are done!