Hi,
 
I found some electrical dynamic blocks on other people's drawing which are so cool because I only have to use one to get all elements I want, such as smoke detect, fire alarm etc in one block.
 
Just wonder who can tell me how to make this kind of block or where I can get learning material?
 
Thanks!
 

Here are some links I have found useful to create dynamic blocks.
http://www.cadmasters.com/class/ACAD2006DynamicBlocks1.pdf
 
http://images.autodesk.com/adsk/files/AutoCAD_2006_Dynamic_Blocks_Part_3.pdf
 
http://www.myigetit.com/vault/courseinfo.aspx?cid=4856
 
I hope these links help.
 

Thanks a lot!