> ## 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.

# How to turn Multiple CAD Faces into a Single Surface

## Objective:

Stitch together CAD faces into a single surface.

## Applies to:

* Texturing
* Defining boundary conditions

## Procedure:

**1.** Start with an [Imported Part](https://support.ntop.com/hc/en-us/articles/360049994434)

**2.** Select the faces you want to merge by holding CTRL (they will highlight up as blue).

* * Once you have selected all of the faces, Right-Click and choose the option "**Create** **CAD Face List Variable**". This will create a list that is the size of the number of faces you selected. In this example, we choose 6 faces, so the block will have a (6) behind its name, with 6 being the size of the list.

![Creating a CAD Face List by selecting faces of the imported CAD body](https://files.learn.ntop.com/help-articles/meshing-workflows/360097972434.png)

**3.** Add a **Stitch CAD Surface Bodies** block. This block merges multiple sheets within a tolerance range and outputs the results as a list. However, this block comes auto-populated with a list. You **cannot input a list into a list.** You need to delete the auto-populated list in order to input the CAD faces from Step 2.

![Stitching together the CAD face list using the Stitch CAD Surface Bodies block](https://files.learn.ntop.com/help-articles/meshing-workflows/360100240873.png)

**4.** Add a **Mesh from CAD Body** block to turn the stitched surfaces into a Mesh. This step will make a Mesh that has a list of (1). If you get an Invalid Input Error, go to this [article](https://support.ntop.com/hc/en-us/articles/1500000953901), or see Step 5 for how to fix it.

![A mesh created using the Mesh from CAD Body block](https://files.learn.ntop.com/help-articles/meshing-workflows/360097997734.png)

**5.** Add a **Remesh Surface** block to create a single surface with uniform polygons. This will clean up the mesh. Instead of inputting the **Mesh from CAD Body (1)** block from the previous step, we want to open up its Properties and take out the Mesh \[0] Property to use are our input. This gets rid of the [lists of one](/help-articles/knowledge-base/user-interface/how-to-work-with-lists), which will be helpful for downstream workflows.

![Remeshing the surface mesh that was extracted from the Mesh from CAD Body properties panel](https://files.learn.ntop.com/help-articles/meshing-workflows/360100262793.png)

And that's it! You've successfully merged multiple CAD Faces into a single surface.

Are you still having issues? Reach out to the [support team](https://support.ntopology.com/hc/en-us/requests/new), and we'll be happy to help!

## Download the Example file:

* [Example File](https://files.learn.ntop.com/Support%20Article%20Example%20Files/Knowledge%20Base/Meshing/How%20to%20turn%20Multiple%20CAD%20Faces%20into%20a%20Single%20Surface.ntop)

## Keywords:

*cad Mesh face surface CAD faces list meshing variable beginner remesh multiple merge join one single stitch*