I needed to build a custom gusset plate with holes that matched an 8" caster. I downloaded a caster from McMaster-Carr and built the gusset on the corresponding face of the caster. Now I cannot seem to separate, delete, or suppress the caster. I was hoping to generate gcode for the gusset plate, but I have to first get rid of the caster. Is there anything I can do to remove the caster from the gusset?