Tutorial - Relations in Pro Engineer Wildfire aka Creo Elements Pro?
Here is the tutorial.
Start Creo Elements aka Pro Engineer wildfire in Part mode.
Draw a circle of 100mm dia.
Double click the part. It will show all the dimensions.
Now select the height and then type = after that 2* then click the dia then +2.8. Click OK.
Now regenerate by pressing CTRL+G.
And we can see that the height is changed.