Multilevel numbered equations

[forumcash]

I need to number my equations as follows:
If it is under Heading 1 => "Heading 1 #"."Equation #"
If it is under Heading 2 => "Heading 1 #"."Heading 2 #"."Equation number #"
If it is under Heading 3 => "Heading 1 #"."Heading 2 #"."Heading 3 #"."Equation number #"


and so on.
Also, equation number should reset for every Heading 1 (Chapter).
Is it a doable thing in Microsoft Office Word? If it is not, why?