I am hoping that someone on here that is more familiar with Wildfire 2 than myself can help me out with a Swept Blend issue I have encountered. Here's the full story. I created a surface model in 2000-i2 that had a cupped up beam feature(Advanced-Swept Blend-Surface) in it. Try to picture a feature that resembles half a tube tapered at about a 20 degree angle along its spine trajectory. The surface feature was defined by 4 sub-sections that were all derived from existing datum curve features via Use Edge functionality in Sketcher. I created the sub-section datum curve features by sketching their single arc entities on 'Make Datum' planes that were 'Through' 'On Curve-Actual Length' datum point features and 'Normal' to the existing spine trajectory datum curve feature. This worked beautifully through 2001. I could modify the trajectory or sub-section datum curve features and the surface feature would update with respect to these changes. No problems whatsoever. Okay. I had a requirement last week for a similar part model, so I did a 'Save A Copy' on the above-described surface model in Wildfire 2. Opened it up and modified the datum curve features' dimension parameters for the new design requirement, and the Swept Blend surface feature did NOT update. Is there any way around this problem in Wildfire 2? Unless I am mistaken, an Extrude feature in WF 2 will allow the user to check off an option for making their section sketch associative to a pre-selected datum curve feature, or an internal section sketch that is non-associative. Or something similar to this. Regarding the Swept Blend in WF 2, I guess I'm just SOL regarding the utilization of existing datum curve features for my trajectory and sub-sections. Thanks to everyone for your time. V.H.