How do I cut off a portion of an extruded part?

[derekhqle]

As you can see in my screenshot, I extruded the blue part upward and it cut through my main object’s body. Can anyone tell me how to cut off this extra part that sticks out?

[Oregonerd]

Try the replace face tool.

[Oregonerd]

You can also use the subtract tool (leave original bodies) and then delete the sticking up bit.