If you want to create many similar plans and avoid manual work, you can duplicate created palans including their plan variants. To do this, go to the "Products" tab and click on the "Duplicate plan" button next to the plan.
Note that the external ID of the plan variant is removed during copying, since it must be unique. After the copying process, you can add these manually.
During plan definition, you can change the plan name and other settings. Finally, click "Save".
The package and all plan variants have now been copied and can be viewed in the product overview.