driven dimensions

Are driven dimensions addressable?
Driven dimensions as reference dimensions are the obvious benefit, but can their values be passed or referenced elsewhere like variables can be?
sketch could not be solved then defining a dimension
I can resize sketch freely, but then I tried to set a dimension it fails. any thoughts on why it's happening?
line ends not connected at DXF import
I unfolded a Sketchup volume and exported it as a 2D DXF. I sucesfuly imported is as a DXF into a Onshape sketch. Now i want to dimension this line drawing ,and chanche the line lenghts. But somehow the lines ends dont seem to be connected anymore. Is there a function in Onshape to conect all these line ends at once?

Are driven dimensions addressable?
Driven dimensions as reference dimensions are the obvious benefit, but can their values be passed or referenced elsewhere like variables can be?
sketch could not be solved then defining a dimension
I can resize sketch freely, but then I tried to set a dimension it fails. any thoughts on why it's happening?
line ends not connected at DXF import
I unfolded a Sketchup volume and exported it as a 2D DXF. I sucesfuly imported is as a DXF into a Onshape sketch. Now i want to dimension this line drawing ,and chanche the line lenghts. But somehow the lines ends dont seem to be connected anymore. Is there a function in Onshape to conect all these line ends at once?

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