Flush End Caps

Hello,
  I'm new to Solidworks, so I apologize if this is astupid question. I've created a weldment from a 3d sketch, and usedend caps. However, the end cap extends beyond perimeter. I need itto be flush with the cross member. In other words, the structuralmember (3" x 3" x 1/4") needs to shortened 1/2"(1/4" end cap at both ends). How do I do this?

Thanks in Advance,
Larry GraySolidworksWeldments