During takeoff, Estimating allows you to make adjustments to the model specific to the estimate. Your changes do not affect the database model and are not reflected in the estimate until you generate the model.
Before you begin
Open the database that contains the model you want to take off. How?
To customize a model for your estimate:
On the Home tab, from the Takeoff group, click .
(In classic view, click Takeoff menu > Model Takeoff, or click on the toolbar).
Enter a model instance identifier in the Reference field.
Because you can take off a database model off more than once, the Reference field can help you distinguish between instances of that model in the estimate.
Tip: When you can progress no further in the model, you may eventually do some fine-tuning on the spreadsheet. After that, you should avoid making changes in model takeoff because regenerating may destroy some of the details you entered in the spreadsheet.