Step 1: Go to Orders --------> New Orders
Step 2: Select the order that you want to process and click on conform
Step 3: Go to Print Labels, when it shows Ready for Print click on Print Label, Print Invoice and download the labels from Exports job
Step 4: Click on Generate Pickup Manifest, select the Marketplace, and courier name, and then select the orders for which you want to generate the manifest and then click on Add to Manifest and Create Manifest, download the generated manifest from the exports job
Click here to know the complete process for Generating pickup Manifest