Is there a way to add masking to a cell to hide lines when used?

I am trying to make our one line symbols a little more efficient.  I want the symbols to hide the line is gets inserted on.  We draw our lines and then place the equipment on those lines.  Then we have to go through and trim the lines out.  I want to draw a shape behind the symbol with a fill but i can't seem to find a way to make it not print.  Looking for ideas.