Cutting a part shorter

Hi,

I have the attached file I obtained of a syringe tube and I would like to cut the top part off, more specifically I'd like to keep 40 mm length of the tube measuring from the bottom up. I thought of making a block extrusion of 40 mm length and then combining the two features but I'm having trouble even making the extrusion because I'm not familiar with extruding XOR drawings. Any other approaches are welcome too.

Thanks all,

-JP

SolidworksParts And Features