Yes, you can convert all the quotes or invoices you have created in the sell tab. In the Quote or Invoice page, click on the Fulfill button on the top right of the page. A pop up will appear. Choose the Pick, pack, ship button.
Choose the pick, pack, ship button.
Go to the Pick, pack and ship module on the sidebar menu. Click on the pending tab. All the quotes and invoices converted to pick, pack and ship are shown here.