How to Offset Assembly Surfaces

[Cadmanto]

I have an assembly that I am trying to offset surfaces from other components

to create a different part.  I have this part inserted into the assembly (only planes and axis exist on this part for now).

When I try to edit it in the assembly, and select "Copy Construction" from the surfaces menu it will not select the surfaces I need.  First is this the correct command?  This looked like the closest to an offset surface command.

If not, what is the correct command?

I should also add that this assembly has welds in it, if that makes any difference.

Thanks

[JDMather · Accepted solution]

Sounds like Derived Component would be better technique

or

edit new part within context of assembly and Copy Object as surface and then Thicken/Offset.

[Cadmanto]

Thanks JD.

If you read what I wrote I am trying to edit the part within the assembly which is a derived part. 

What you suggested regarding the copy object is working.  That is what I was looking for.  Prior to using that

command I was not allowed to select any of the surfaces from the other components.  Now I need to figure out a way to

select the weld surfaces.  Any ideas on that one?

[Cadmanto]

Figured out the weld issue.  Just did a revolved surface in those areas within my surface part.

[ampster401]

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@Cadmanto wrote:

Thanks JD.

If you read what I wrote I am trying to edit the part within the assembly which is a derived part. 

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Adaptivity is what would usually happen when you edit parts within an assembly, not derived.