Thanks for sharing your query here with us today, LodiValley. Let me provide insights on your sales transactions when moving data from QuickBooks Desktop to QuickBooks Online.
When migrating from QBDT to QBO, several lists of transactions, reports, items, and other data can be imported to the online version. However, all memorized transactions, audit trails, previous reconciliations, billable journal entries, pending sales, and others can't be available and moved to QBO. You can check out this article for more detailed information: Learn how features and data move from QuickBooks Desktop to QuickBooks Online.
Usually, sales transactions can be imported as sales receipts and invoices like how you entered these entries in the desktop version. In your case, you've possibly condensed your data file before moving to the online program. That is why your entire career sales are combined into one journal entry.
However, if you haven't condensed and streamlined your desktop data before importing, you can try migrating your company file again to help identify the root cause of this issue. To do this:
I'll always be in this forum whenever you need help with managing data in QuickBooks. Let me know in the comments below, so I can provide further assistance. Keep safe!