Nominal Grid - Editing a Line

To edit an existing line on the Nominal grid you can click on the edit button on the far left of the screen against the line in question. When you click on the Edit button the fields on the line will change to boxes which can be edited.
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If you change you want and want to discard the changes you've made you can click on the button with a backwards-pointing arrow on the left of the screen.
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Once you have made the required changes click on the Save button on the far left.