You can delete workflow steps at any time.
To delete a batch workflow step, from the Batch Entry page in Administration, click Batch workflows under Configuration. The Batch Workflows page appears. Click the name of a workflow to go to its record. From the batch workflow record, in the Step 2: Define the steps used to transition a batch from one status to another grid, click the double arrows next to a step to expand its row. On the action bar, click Delete.