Note: Dunning rules that are configured on AR terms cannot be deleted. If you need to delete a dunning rule that is in use load the 'References' tab to see where the dunning rule is in use and change the AR terms using it to instead use an alternate dunning rule. Once a dunning rule is no longer in use by an AR term it can be deleted.
Under the Dunning Rules heading on the left select the rule you wish to delete
Under the same Dunning Rule heading on the left click the icon
On the confirmation dialog that appears select Yes
If you only wish to delete a level under a rule, edit the rule and next to the Level you wish to delete select the icon
Select the icon that appears and the level will be marked for deletion
Select Save to delete the levels that you have marked for deletion