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I have searched the internet and have come up empty handed about this. I was curious if Autodesk sent out a patch or update where we can use dynamic blocks for electrical devices. It would make it a lot easier to have one block for multiple 2x4 light fixtures.
I'm running 2016 & 2017 MEP
The answer is no. They have catalogs of different parts/symbols/fitting/etc. Some of these objects have different sizes which is similar to changing a dynamic block.