I'm not having much luck finding anything on the subject, perhaps it is the search terms I am trying to search for.
Here is my situation.
I have a library of 500 sign blocks that I want to add custom user parameters to. These parameters are then used to fill in an attribute that labels the quantities of the sign.
The current process would be, block edit
open the parameters manager, create new user parameters, then move on to the next one.
In my mind I would think there should be some way to add them via LISP. Although anything I have found doesnt seem to work the way I'm expecting it to. Things seem to run, but nothing seems to work. I know that no matter what method I use, I will have to do some manual cleanup with the sizes for the various signs, but I figure if I can get as much of the process automated as possible, the quicker the process would go.
These are the parameters I'm trying to add:
SignBaseHeightFt with a value of 5 Show
SignHeightIn with a value of the sign height default 30 Show
SignWidthIn with a value of the sign width default 30 Show
SignPosts with a value of ceil(SignWidthIn/35.99) No Show
SignArea with a value of (SignHeightIn*SignWidthIn)/144 No Show
SignPostLength with a value of (SignHeightIn/12+3.5+SignBaseHeightFt)*SignPosts No Show
Any guidance that can be provided would be appreciated.