Inserting a Dynamic Block and Setting its attributes, parameters and visibility state

That seems to have fixed it! Thanks so much

No problem. Lee Mac has a strong back to stand on.

I have a dynamic block you might be interested in after taking a look at yours. I didn't make this particular one but I've made others like it.

SectionSample.dwg

Might make your life a bit easier.

Just out of curiosity, what does the LM: do before the function definition? I know that C: makes it so acad recognizes it as a command, but I haven't seen any documentation showing LM:. Is it just Lee's 'signature' on his functions? Does it serve an active purpose in the code?

Is it just Lee's 'signature' on his functions?

Yes .....