CATIA V5 : Specification Tree Management Part-1 : Start-Up File and Partbody

[@abhijeetmane8]

While giving draft to ribs why you select neutral face as extract surface & not the flat upper face of rib

[@cadcars7541]

Yes, coz basically,we need to keep the root thickness of rib as per design guidelines, to avoid sink marks and other irregularities.
If base surface changes, with design change, we can replace surface and easy update the 3D
As a result, It ll update the drafts and children components