Fedex allows you to ship a single order with multiple products in more than one package but under the same tracking number. To have multi-packet shipment please follow the steps given below-
Go to the admin panel and click on order section.
Now click on the vertical ellipsis on the order for which you want multi-packet shipment.
Upon clicking ship now, you would get an option to select the pickup address as shown
From the Select Shipping Method that appears after selecting the address, click on Fedex
Now you would get an option to select the package weight (Total weight of the package) and package count (Number of packages). Enter the desired information into the above categories.
From the select service option, click on the service you are choosing.
Lastly, select the date and time of the pickup and click on create pickup.