You can associate up to five (5) dangerous goods commodities with each FedEx Express package. Dangerous Goods settings must be configured here before trying to select the Dangerous Goods option from the Shipping window.
To process a Dangerous Goods shipment:
Select the Package Options tab.
Enable the Dangerous Goods check box.
In the Profile field, select a hazardous material
from the drop-down list.
To add a new hazardous material for this shipment
You may also press the " ... " button beside the Profile field to enter information for a new hazardous material. The new hazardous material will be maintained for this shipment only. To permanently add an entry to the hazardous materials database from here, you can click the " ... " button next to the HazMat Profile ID to access Hazardous Materials Profile Maintenance.
Click OK when you are done.

The information for that hazardous material populates the tab. Enter the number of packages that contain this hazardous material in the # pkgs containing field.
When you are done, you may click the + button to add another hazardous material to this package.
Add as many packages as necessary, then press Save or F5 to save the shipment.
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+ add entry
- delete entry
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Additional Info:
Dangerous Goods Shipment Settings
FedEx Hazardous Materials Profile Maintenance
FedEx.com - Dangerous Goods Info