In the Configuration Manager console, navigate to System Center Configuration Manager / Site Database / Computer Management / Operating System Deployment / Task Sequences.

To start the Task Sequence Editor, select the task sequence you want to update, right-click the task sequence, and then click Edit.

To add a new task sequence step or a new task sequence group, click Add and select New Group or the task sequence step you want to add.

To remove a task sequence step, select the task sequence step you want to remove, click Remove, and then click Yes.

You can also click the Options tab to update the options associated with the task sequence step.

Click OK to close the Task Sequence Editor.