lets start our exercise by opening Creo Elements /Pro formally Pro Engineer. I will suppose you have very basic knowladge befor starting this exercise.
First Make a rectangle of 100 x 50 dimension and extrude it Up the depth of 10 units. depth diemension is not case sensitive. Your part after extrude should looks like this

fig.1
now select the front surface of your solid plate and click on sketch button so you can sketch a feature for our exercise In sketching window sketch a circle near to the left width of plate.

fig.2
just click on done and than click on the extrude button.so we want to extrude this circle in up to the height of 10 units.

fig.3
Now select the new small cylinder that you just made above and clcik at the patteren button. in patteren dashboard select “dimension” as a paterren feature. Before moving forward you can observe there are 3 dimensions assosiated with small cylinder
- Diameter
- distance from side
- height of small cylinder

Fig 4

Fig.5

Fig. 6

Fig.7
