Hi Everyone,
My name is Marc, I'm a french technician (English is not my native langage sorry if I make mistake)
I need your help, because I would like to create a lower offset 10.2 mm from my upper "skin".
I created the shift of the surface without difficulty, but I can not properly shift the "holes".
I get discontinuities and overlaps.
Please find enclosed my ".asm"
PS : I havent create the brace/spacer.
Thank for your help.
Marc
With many features, you have the option to create material or remove material with this icon: 
Sorry for the delay, Marc, but I have been out of town and could not get back to the conversation.
I find that the skin model you have for the upper skin is very poorly defined and Creo is having trouble healing it. Again, I am no expert on the import data doctor, but in general, it keeps failing to thicken or offset consistently. Someone else may have better luck with it. In theory, you should be able to do a simple 2mm thickening and create the hole feature. I find the IDD very frustrating!
However, to get back on subject, the arcs in the bottom of the upper skin model are a semi-circle by definition. Therefore, you can create an axis on each of the bolt recesses by simply clicking on the arc. There are also endpoints (vertices) on the arcs where you can pick 3 vertices and define a plane (or the axis and 1 vertex). On this you can define a sketch you can revolve to make the feature you are looking for.
Here are some images as to what you can do:
Again, I am not sure what you are looking for as an end result. Just know that there is limited interaction between solid features and surface feature. If you need to blend this somehow, I recommend working with surfaces but the errors in the original import model will give problems with the solidify feature or thicken feature.
This was certainly a lot more work than I would have ever anticipated with the IDD.
I used a combination of IDD fixes and surface removals and replaced them with native Creo features.
Don't ask me how I got the things to work in the IDD because I honestly do not know. Removing the 2 fillets (rounds) and trimming the surfaces together were done in IDD. Fixing the one corner somehow got fixed with IDD.
I had to fix a sliver in the 3rd fillet with a boundary blend. And I had to create the edges with individual boundary blends. Subsequent merge features finally closed the entire volume to allow the solidify to work.
I used the technique I described above for creating axes for the hole features.
I have attached the file in Creo 2.0 full version and a STEP file. In some cases, I would even opt to use a step version in my Creo session just to "lock" the file from failing in the future.
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