OK. It would be helpful to have a block that drives many different extrudes in multiple parts in an assembly. I am in luck since I can create a block, save it in a folder, insert the block and link it to the original file. Really cool! That way all I need to do to add 0.010" to a dimension is to edit the original saved block and it updates all the places that use the block where I have "Link to file" checked.

My questions:

1) How do I edit the original block? Even though it is a "SLDBLK" file I don't seem to be able to open it with Solidworks directly.  Best practice here?

2) What is best practice for saving that block file in a safe place that makes sense? Since many different parts in the assembly now depend on it it seems that someone has thoght this through and come up with a good way to keep that block file safe and sound in a standardized place?