You can now add an existing certification to a Learning Path.
Step 1: Select your learning path.
Step 2: Select "Schedule" from your learning path menu.
Step 3: Select the day in which you would like to add the existing certification, then click on the "+" sign.
Step 4: Select "Certification".
Step 5: Select "Existing Certification"
Step 6: Search for the desired existing certification
Step 7: Select the existing certification
Step 8: Existing certification should now be visible and assigned to your learning path.