How to enter invoice for purchase of mobile for personal use?

Hi there, @archana walavalkar. I've got here a few steps you can perform in entering an invoice for purchase in QuickBooks Online (QBO).

If you're referring to enter the invoice for a purchase, you can record it as an expense or bill in QBO. This depends if the item is paid on the spot (Expense) or you'll pay it later (Bill). I'd be happy to guide you how:

1. Sign in to your QBO account and click the +New button.
2. Select Bill or Expense.
3. From the Supplier dropdown, choose the supplier.
4. Pick the Bank Account you used to make the purchase.
5. Enter the item you purchase in the Category details or Item details section.
6. Then, input the amount.
7. When done, click Save and close. 

To get more information about the process, feel free to open this article: Learn the difference between bills, cheques, and expenses in QuickBooks Online.

On the other hand, if you're referring to handling a personal expense paid with a business account in QBO. You can record it as an expense or cheque. Here's how:

1. Click the + New option.
2. Then, choose Check or Expense.
3. From the drop-down menu, select the Payee.
4. Pick the Bank Account you used to make the purchase.
5. Enter the item you purchase in the Category details or Item details section.
6. Then, input the Amount of the purchase.
7. Select Save and close when done.

After that, you'll have to create a bank deposit to reimburse the company.

Just in case you have a business expense in QBO that you paid with personal funds and want to repay the money, you can check this link for the detailed steps: Pay for business expenses with personal funds. 

You can count on me if you ever need additional help about entering an invoice for purchase in QBO. I got your back. Keep safe always.