In QuickBooks Online (QBO), you can only add the ship date field to invoices, estimates, and sales receipt, matt269.
For sales orders, you can manually add this information in the Note to Customer field. Here's how:
1. Navigate to the +New button.
2. Click Sales Order.
3. Fill out the necessary details.
4. Enter ship date under Note to Customer field.

5. Hit Save and Close.
If you also want to add shipping address to the invoices created from the sales orders, you can customize the form.
Moreover, once you start receiving your customer's payments, this article provides detailed steps for tracking: Record invoice payments in QuickBooks.
This thread is available for any further questions you may have about managing your sales order in QBO. Simply click the Reply button, and we'll get back to you as soon as possible.