I regret that though I could perhaps help you with the first task, I doubt I could do the second task.
I have Opted Out in favor of a more certainly qualified Expert at PHP coding. (But have not cut off communication, and I will get back to the case to at least help with the first task, if nobody else takes it up for 24 hours or so, if you wish and Reply at that time requesting that I do so.)
Thank you for explaining the tasks you wish to have done.
I have seen your posts.
OK. What's the code that is for a form, an entry form that is, and that needs some fields to be Required Fields, others to be optional or can-be-blank ?
I do not know PHP Designer8 well enough to make much use of it, even if I did connect to your computer, I'm sorry to say.
Looking it up... I don't find any particular indication as to what I would do if I did connect. I would, at this point, be in a blind search for
'What file is the code you want altered, stored in?'
'Where on the computer is that file stored?'
If you know, or could tell me, those two vital points, I might make some progress if I tried.
It might well be a .JS script file, yes. Active scripting is usually used to 'verify' whether a form has the fields filled in.
I'm not sure I could doctor the code from just the .JS file - it might be handy to have them all.
Posting a ZIP file might be good.