why items and quantity option is not showing while creating bills

The Items table isn't showing because it has been disabled, Akhil.

When creating a bill, we need to turn on the Show Items table on expense and purchase forms so you can utilize the Item details section. Here's how:

1. Go to Settings.
2. Select Account and settings, then choose Expenses.
   
   
3. In the Bills and expenses section, select the pencil icon.
4. Turn on the Show Items table on expense and purchase forms switch.
5. Click Save, then Done.
    

After that, record the payments made to keep your books accurate. For guidance, refer to the Record payments toward bills section of this article.

Whenever you need further assistance in creating a bill, please don't hesitate to add the details below. We're here to address them promptly.