To Use the Part Size Not Found Dialog

Sometimes, when adding or modifying a part (such as duct or conduit), the size that you define does not fit the criteria defined in the part catalogs. In such cases, you are prompted with the Part Size Not Found dialog box. Use this dialog box to select an alternate size definition for the part.

The top portion of the dialog box indicates the size criteria that is incompatible with the part you defined. For example, you specify a height for a takeoff. If the values that you define in the part filter are not matched within the catalog, you can create a custom size.

To… then…
use a part from the catalog select a part size from the list, and click Use selected part size from catalog.
create a new part to maintain the values that you defined click Create custom sized part.
revert to the original dimension for the part click Undo change.