EDITING BLOCKS

I have several notes saved as blocks in the design library.  Is there a way to edit that note in a drawing without it overwriting the original block?  For example there is a weldment note that also says to not powdercoat the threads.  If the part doesnt have threads then we will delete that line from the note.  But when I do that it saves over the original block.  I have copied the text from the block and pasted a new note but is that the only way?

SolidworksDrawings And Detailing