How to change the floor graphic under a workshop

dwarf-fortress

I built a couple of workshops on the clay floor. Right now I am redesigning a little to have marble wall and floor and the clay color underneath the workshops bothers me.

Is there any way to change the floor underneath a workshop from clay to marble?

Best Answer

I'm not sure what exactly the other answer is referring to with 'Replace Floor', but you can achieve your desired result by deconstructing the building and changing the floor tiles to be the same as the surrounding tiles, either via smoothing d > s (assuming the underlying tiles are marble) or building a floor b > C > f and then selecting marble.