Relationships with a block

Is there a way to have relationships with a block?
I want to draw a line and have it snap to end points or a midpoint (or any relationship)
to a point on a block inserted in my drawing.

Re: Relationships with a block

Nevermind, I see that you can snap to blocks, however the block i had problems with
came from an AutoCAD file and had special grouping of components and that was why
I was not able to snap to any points of that particular block.