How can i enter import purchase

I'm glad you turn to the Community for support, success-msmestra.

In QuickBooks Online (QBO), you can only import the following information: Bank Data, Customers, Suppliers, Chart of Accounts, Products and Services, Invoices, Bills, and Journal Entries. For transactions like purchase orders, you'll want to enter them manually. 

To create a purchase in QBO:

1. Select Purchase order under Suppliers from the Plus (+) icon.
2. Fill in the necessary information.
3. Click on Save or Save and close to record the transaction. Or, tap on Save and new if you wish to enter a new purchaser order.

You are free to visit this link for more information about managing vendor transactions: Expenses and suppliers.

I'm sharing this article to answer your other questions related to importing data in QBO: Common questions about importing data to QuickBooks Online

You know where to go if you have follow-up questions about importing transactions. I'll be here to assist you further.