> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Optional: Mesh Portions Test Problem

Now that you have learned ways to select portions of a mesh in nTop, feel free to try this optional problem with a review of the answer in the following lesson.

Given the final FE Volume Mesh from the previous optional test problem, create two boundaries containing faces as shown below.

<Frame>
  <img src="https://files.learn.ntop.com/lessons/optional-mesh-portions-test-problem/102_29_OuterBoundary.jpg" />
</Frame>

First boundary: Select the outer face

<Frame>
  <img src="https://files.learn.ntop.com/lessons/optional-mesh-portions-test-problem/102_29_Halfpart.jpg" />
</Frame>

Second boundary: Select the left half of the part

**Estimated Time to Complete:** 15 minutes

[102\_23\_Complete — Volume Mesh Test Problem.ntop](https://files.learn.ntop.com/Courses/102%20Guide%20to%20Meshing/nTop%20Files/102_23_Complete%20--%20Volume%20Mesh%20Test%20Problem.ntop)

*This file was last updated in 5.12.2*