I don't think there is a tool nor do I know how to really put one in.But what I did do was copy and paste a pic onto another picture as a new layer, moved it to where ever I wanted it to be, then I changed the pasted pic into a mask layer(show all type). Then I took the paint brush and erased the parts of the pic so it will blend with the background picture. After I was done, I merged the two pics together and repeted the same steps for the other pics.