Hi @Darryl
Thank you for your questions!
-
Could you please elaborate on what merge codes you mean?
-
This is a great and I’ve added it to the Wishlist on your behalf - Conditional logic for form fields
-
You just need to make the fields, which must be filled, required. I’ve checked it and everything worked great for me. However, if something is wrong on your end, please describe the issue in more detail (name of your Calculator widget, fields where the issue occurred and the value you’ve tried to enter).