If you want to change one of your custom table formats, you just overwrite it by saving the new format under the same name as the previous version.
If you want to delete a custom table format, select this format from the 窶弋able menu窶, activate the 窶弋able menu field窶 by clicking it once while pressing the 窶廾ption窶 key, and then hit the 窶廝ackspace窶 key. The effect of this is that the 窶弋able menu field窶 becomes empty. Finally hit the 窶廢nter窶 key to complete the operation. As a result your custom table format is removed from the 窶弋able menu窶.
Note that DynRisk does not allow the factory made table format to be deleted.