My parents live in Australia and have written a will. They did so with a lawyer and are not knowledgeable in Halacha. I see you have wills on your website for this purpose. What is the basic process required for them to add this halachic will?
The basic process is to write up the halachic will, based on the details in the legal will, and to have it signed by your parents.
However, matters of writing up a halachic will can be complex, and it is recommended that an expert on the subject should look it over to ensure that everything is legally valid (in the sense of Torah law). When two parents write a will there is also the issue of one of them inheriting the other before the inheritance is passed on to the children.
Best wishes, and please submit again if there are more questions.