The below code creates the new element templates under categories Point, Linear, Terrain and Corridor reading values from .csv file.

The below image shows the content from .csv file.

//Required References
using System;
using Bentley.CifNET.ContentManagementModel;
using System.IO;
using Bentley.CifNET.GeometryModel.ContentManagement;

  public void CreateElementTemplate()
        {
            //Get object space
            Bentley.CifNET.CadSystem.IObjectSpaceManager objectSpaceManager = Bentley.CifNET.ServiceManager.Instance.GetService<Bentley.CifNET.CadSystem.IObjectSpaceManager>();
            if (objectSpaceManager == null) return;
            Bentley.CifNET.Objects.IObjectSpace objectSpace = objectSpaceManager.ObjectSpace;
            if (objectSpace == null) return;
            //Get civil model
            Bentley.CifNET.Model.CivilModel civilModel = Bentley.CifNET.Model.CivilModel.GetCivilModel(objectSpace, Bentley.CifNET.Model.GetModelOptions.CheckIfExist);
            if (civilModel == null) return;

            //Get or create ContentManagementModel
            Bentley.CifNET.ContentManagementModel.ContentManagementModel cmm = Bentley.CifNET.ContentManagementModel.ContentManagementModel.GetContentManagementModelAndCreateIfDontExist(objectSpace);
            if (cmm == null) return;

            //.CSV file name to read data for creating element templates
            string fileName = "D:\\DrawingProduction\\CreateElementTemplate.csv";

            //Read all lines from csv file into array of strings
            String[] lines = File.ReadAllLines(fileName);

            for (int itr = 1; itr < lines.Length; itr++)
            {
                string[] templateParams = lines[itr].Split(',');

                if (templateParams.Length != 2) continue;
                //Read name and category for element template from .csv file
                string templateName = templateParams[0];
                string type = templateParams[1];

                //Get category name based on type
                string categoryName = "";
                if (type == "Point")
                {
                    PointObjectSettingsProvider provider = ContentManagementProviders.Instance.GetApplicationObjectSettingsProvider(typeof(PointObjectSettings)) as PointObjectSettingsProvider;
                    categoryName = provider.Name;
                }
                else if (type == "Linear")
                {
                    LinearObjectSettingsProvider provider = ContentManagementProviders.Instance.GetApplicationObjectSettingsProvider(typeof(LinearObjectSettings)) as LinearObjectSettingsProvider;
                    categoryName = provider.Name;
                }
                else if (type == "Corridor")
                {
                    CorridorObjectSettingsProvider provider = ContentManagementProviders.Instance.GetApplicationObjectSettingsProvider(typeof(CorridorObjectSettings)) as CorridorObjectSettingsProvider;
                    categoryName = provider.Name;
                }
                else if (type == "Terrain")
                {
                    TerrainObjectSettingsProvider provider = ContentManagementProviders.Instance.GetApplicationObjectSettingsProvider(typeof(TerrainObjectSettings)) as TerrainObjectSettingsProvider;
                    categoryName = provider.Name;
                }

                //Get or Add category  
                Bentley.CifNET.ContentManagementModel.Category category = null;
                category = cmm.CategoryObjectSettingsNameSet.Get(categoryName);
                if (category == null)
                {
                    category = cmm.CategoryObjectSettingsNameSet.Add(categoryName);
                    if (category == null) continue;
                    objectSpace.PersistChanges(category);
                }

                string templatePath = categoryName + "\\" + templateName;

                //Create template
                Bentley.CifNET.Model.ElementTemplate template = civilModel.RootFile.GetOrCreateTemplate(templatePath);
                if (template == null) return;

                //Save changes
                objectSpace.PersistChanges(template);
            }
        }

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Output