I started learning Eagle by putting existing boards into the schematic editor and then attempting to do the layout the same as the existing board. The problem I have that not all boards are square or rectangular. How can i redefine the board area to match the project I am working on. For example, the one robot kit I build has a circular board with three "tentacles" protruding to the front where IR led's are mounted. It also has a add on board which solders onto the main board. How do add that extra little board into the equation?