You can add new options to the Subtype list in the Surface treatment properties by editing the product_finishes.dat file.

1. Copy the product_finishes.dat file to your firm, project, or model folder.
   The file is located under the \ProgramData\Trimble\Tekla Structures\<version>\environments folder. The exact file location may vary depending on the folder structure of your environment files.
2. Open the copied file using any text editor.

   The first section of the file explains the available types of surface treatment. The surface treatment types are hard-coded, so do not modify this section:

   

3. Go to the sections that define the options for each type of surface treatment:

   

4. Add rows to define new options.
   1. Define the surface treatment type. For example, 1 for concrete finish.
   2. Define a code for the surface treatment option. For example, MF for Magnesium Float.
   3. Define the full name of the surface treatment option. For example, Magnesium Float. Remember to enclose the name in double quotes " ".
5. Save the file.