Created a form to manage categories and sub-categories along with their properties.

InventoryTest/Form1.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Data.SqlClient;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace InventoryTest
+{
+    public partial class Form1 : Form
+    {
+        private static string ConnectionString { get; } = "Server=DESKTOP-HJES64T;Database=main;Integrated Security=true;";
+
+        public Form1()
+        {
+            InitializeComponent();
+
+            ManageCategoriesToolStripMenuItem.Click += ShowCategoryManagerForm;
+        }
+
+        private void ShowCategoryManagerForm(object sender, EventArgs e)
+        {
+            var form = new CategoryManager(ConnectionString);
+            form.Show();
+        }
+    }
+}