I'm pretty new to drawings - SW continues to baffle me every time

I'm making a simple drawing of a weldment.  I would like to include some dimensions from a layout sketch that is the basis for all my structural members.  I have marked them for importation into drawing.

When I try and insert model items from the entire model they don't come in, when I try and import from selected feature, SW tells me that the feature doesn't have any dimensions.

I see options for pretty much everything else, but can't for the life of me see a sketch option anywhere.

I have resulted into making a planar surface of the sketch, but this seems like an unnecessary step