In the Invoice Line Items group, click Add to display the search page, and find the orders you want. When you have a set of records, do one of the following.
Click Select Set to add all the records in the set to the invoice.
Click the checkbox next to the records you want, and then click Select Records to add just those records to the invoice. You can select records across pages. At the bottom of the browser you'll see the number of records selected. You can click Clear to deselect all the records.
Display a record in full, and then click Select Record to add just this record to the invoice.