How can we start new financial year with Journal Entry number 1. I have-not closed previous financial year though. How can we sort vendor date wise ?

Welcome to the Community, @finance-gahp-net. I'm here to help you sort out your concern.

Are you trying to sort the date of your Journal entries? If so, you can control the sequence in your Journal number. Just enable the Custom transaction number. 

Here's how:

1. Click the Gear icon (⚙).
2. Select Account and Settings and click Sales tab.
3. Select the Sales form content section and check the box to enable Custom transaction numbers. Click Save and then Done.
4. Click the +New icon and select Journal Entry. 
5. In the Journal no. field, enter the correct sequence number you'd like for the entry to have.
6. Once finished, click Save and close.

0nce done, this will make it so every journal entry created after this one will begin sequencing based on the number you entered. If the information of the line items is what's auto-filling based on previous transactions, the only option is to disable the feature. You can do so with these steps:

1. Click the Gear icon (⚙).
2. Select Account and Settings and Advanced tab.
3. Select the Automation section and un-check the box for Pre-fill forms with previously entered content.
4. Click Save and then Done.

With these instructions, you can disable the auto-filling for your journal entries and start with a blank slate every time. Check out our guide on pre-filling transactions for additional information. 

Once it's fixed, you can now start a new fiscal year. I've also attached an article you can use to learn how to record future journal entries in QuickBooks: Create a journal entry in QuickBooks Online.

Also, I've collected these articles that will guide you before closing your books and year-end tasks:

•  How to view Retained Earnings account details
• Learn the reconciled workflow in QuickBooks
• Close your books in QuickBooks Online
• QuickBooks Online year-end guide and checklist

I'm only a post away if you need more help in completing your other tasks in QuickBooks. It's always my pleasure to help you out again, @finance-gahp-net.

Thank you for the information.

Entering the same number gives out a message of duplicate journal entry even though the financial year is difference. I want to make sure that my new financial year journal entry starts with 1 rather than the continuation of journal number from previous financial year.

Also, I wanted to see my vendor details for a particular year only but there is no option of sorting ot by dates. I annoy verify how much did I owe to a vendor in a particular year end as it will show the vendor details on cumulative basis.

Thanks for posting here, @finance-gahp-net.

Allow me to share some insights about this numbering feature in QuickBooks Online.

The sequence of the transaction numbers in QuickBooks is set by default to continue even after a Fiscal Year ends. This is the reason why you will get to duplicate number error when you set the same number of an existing transaction.

To use the desired number, just click Yes on the pop-up alert. Otherwise, you can use a different combination like "1A", to give you the same sequence starting at 1.

Please post here again if you have other questions or concerns about creating transactions in QuickBooks. I'll be right here to help you out.