Start by going into Objects and Containment and creating three new objects:
Click Components for 'Part Container'
Add both 'Part1' and 'Part2'
Set the Min/Max for 'Part1' to 3/3
Leave 'Part2' at 1/1
Let’s change the color of each of the new objects to make identifying them easier, go into Define Object Dimensions and 3D Control and give each object a new color
Lastly check Display Object Value, this will show the name of the object during simulation