Steps to add service plans in Plesk
1. Login to your Plesk panel.
2. Click Service Plans, on the left side of the pane.
3. Choose the type of plan you want to create from the tabs at the top.
4. Click 'Add New Plan' button.
5. Type a name for your new plan.
6. Adjust the settings to your preference.
7. The other settings and tabs are fine as the default values. You can change the values if wanted.
8. Click 'OK' to create the new plan.
To manage the plans, click a plan's name.