There are various ways that you can edit Labor Items in your SI 2017 Catalog.
The Edit button allows you edit the Labor Item selected. Make your changes and then Save the Labor Item.
This feature allows you to update properties for multiple Labor Items at a time. See here for details.
The Price Rules function allows you to update pricing via formulas you create. Click here for details.
The Accessories button allows you add Accessories to multiple Labor Items at a time. Click here for details.
This feature allows you to select a Labor Item and then find all Items that it is an Accessory of, as well as any Packages that contain the selected Labor Item, then replace it with a new Labor Item. Click here for details.