If You want to tag Items Under Services Or goods, follow these steps:
Step 1: Go to Administration, select Masters, then click on Items, and finally click on Modify.
Step 2: Select the item and Set the tax category to goods/Services. If you want to create a new tax category, press F3 on the tax category and create it.
Step 3: Also, check the HSN code. It should be a goods HSN code. For this, click on Validate and check.
Step 4: You can also create item groups for goods and services or tag items under these groups.