Surface finish & flatness - partial surface

[David R]

Does anyone have any tips on how to do a call out for surface finish and flatness on partial surface?

I have a square part which on the bottom there needs to be a surface finish on a rectangular area of the middle of the parts surface. I’m not sure how to do this I was thinking of drawing an imaginary rectangle on the surface and attach the surface finish and flatness symbol to it with a note. Any other better ideas?

 

[chez311]

Something like the below from Y14.5-2009 for a limited area callout.