Raw surface on drawing

Hi,

When I design some parts ( mainly aluminium) I don't all surfaces machined as a standard dimension for one side of the part could be good enough for the application. I wonder how to show that on my drawing. Actually this could be more a technical question but does someone has the same case and what do you do then? By showing the information on the drawing the price of the part is obviously going down.

Thanks

Damien

SolidworksDrawings And Detailing