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Editing in Context Question

I have created an assembly for inserting the different sections of a locomotive boiler. I want to create indivitual Part Studios for each section. I am doing this to add the details of each section in it's own studio so that I don't override the feature elements and get myself in trouble with do much in one Parts Studio.
The issue I am experiencing is that Once I do an edit in context to create the Parts Studio, and do a copy in place, I don't seem to be able to maintain the sketches I inserted into the assembly.
Is there a workaround for this? Or am I missing something? Appreciate the help.
Thanks
Here is the assembly:
https://cad.onshape.com/documents/1d72515be4b7f965444b8e21/w/8ff35d8d6c3db7b1333897e9/e/af2d666eabfe773828aa8d30
Here is the Parts Studio for the smokebox. I had to manuely place the sketches to be able to use them as I would like.
https://cad.onshape.com/documents/1d72515be4b7f965444b8e21/w/8ff35d8d6c3db7b1333897e9/e/a638d054615de8fe29292f1f
Comments
Hey @jack_erhart,
You would probably be better of using the derived feature to bring one multiple (master-) sketches in the individual Part Studios.
If you need to work on interfaces between some of the parts you can still add them to your assembly and use in-context design.
Here is a course about master model design that also used the "derived" feature: https://learn.onshape.com/courses/master-model
Thank you David,
I had fogotten about being able to use derived for sketches. That worked great, and kept the sketch positioned just like I needed it.
I appreciate the help.