Is it possible to add/delete columns or rows from the Repair Cost Estimator/Repair Cost Budgeter?

Unfortunately, you cannot add or delete rows from the Repair Cost Estimator.

The Repair Cost Estimator is pre-built w/ 24 Scopes of Work with 20 line items each.  These scopes of work & work items are completely customizable so you can adjust, tweak or change the existing item as necessary to fit your project or business needs.