Hi Taqdeer,
You need to add a Catalog variable type is "Rich Text Label".
Step-1: You need to keep your data in a table format like below.
Step-2: Display the portal item form like below.
Thanks.
function onSubmit() {
if (g_form.getValue('category name') == 'name of the choice')
{
g_form.addErrormessage("Your Selected choice is Disabled");
return false;
}
}
